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Fixed Income Investments [Member]

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Name	FixedIncomeInvestmentsMember
Namespace	http://fasb.org/us-gaap/2021-01-31
Prefix	us-gaap
Data type	dtr-types:domainItemType
Period type	duration
Substitution Group	xbrli:item
Balance	None
Nillable	True
Abstract	True

Text	Lang	Role	Container role
Fixed Income Investments [Member]	en-US	http://www.xbrl.org/2003/role/label	http://www.xbrl.org/2003/role/link
Investments that regularly generate a fixed amount of interest income. Examples include, but are not limited to, bonds, certificates of deposit, notes and debt securities.	en-US	http://www.xbrl.org/2003/role/documentation	http://www.xbrl.org/2003/role/link

Name	Value	Role
elementCreationTaxonomyVersion	2009	http://fasb.org/us-gaap/role/tin/taxonomyImplementationNote

Name	Relation Type	Role
Corporate Debt Securities [Member] `us-gaap:CorporateDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Bond Securities [Member] `us-gaap:USTreasuryBondSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury and Government Short-term Debt Securities [Member] `us-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Government Agencies Short-term Debt Securities [Member] `us-gaap:USGovernmentAgenciesShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Municipal Bonds [Member] `us-gaap:MunicipalBondsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Taxable Municipal Bonds [Member] `us-gaap:TaxableMunicipalBondsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Nontaxable Municipal Bonds [Member] `us-gaap:NontaxableMunicipalBondsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Municipal Notes [Member] `us-gaap:MunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Taxable Municipal Notes [Member] `us-gaap:TaxableMunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Nontaxable Municipal Notes [Member] `us-gaap:NontaxableMunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Debt Security, Government, Non-US [Member] `us-gaap:ForeignGovernmentDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Foreign Government Short-term Debt Securities [Member] `us-gaap:ForeignGovernmentShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] `us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] `us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal Housing Administration Certificates and Obligations (FHA) [Member] `us-gaap:FederalHousingAdministrationCertificatesAndObligationsFHAMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] `us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] `us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Collateralized Mortgage Obligations [Member] `us-gaap:CollateralizedMortgageObligationsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Asset-backed Securities [Member] `us-gaap:AssetBackedSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Adjustable Rate Loans [Member] `us-gaap:AdjustableRateLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Variable Rate Demand Obligation [Member] `us-gaap:VariableRateDemandObligationMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Loan Participations and Assignments [Member] `us-gaap:LoanParticipationsAndAssignmentsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Bankers Acceptance [Member] `us-gaap:BankersAcceptanceMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Commercial Paper [Member] `us-gaap:CommercialPaperMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Bank Loan Obligations [Member] `us-gaap:BankLoanObligationsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Auction Rate Preferred Securities [Member] `us-gaap:AuctionRatePreferredSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Notes [Member] `us-gaap:SeniorNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Loans [Member] `us-gaap:SeniorLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Subordinated Debt [Member] `us-gaap:SubordinatedDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Public Income Notes [Member] `us-gaap:IncomeNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Deferrable Notes [Member] `us-gaap:DeferrableNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Payment in Kind (PIK) Note [Member] `us-gaap:PaymentInKindPIKNoteMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Unitranche Debt [Member] `us-gaap:UnitrancheDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Subordinated Notes [Member] `us-gaap:SeniorSubordinatedNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Subordinated Loans [Member] `us-gaap:SeniorSubordinatedLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Junior Loans [Member] `us-gaap:JuniorLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Junior Notes [Member] `us-gaap:JuniorNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Junior Subordinated Debt [Member] `us-gaap:JuniorSubordinatedDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Corporate Debt Securities [Member] `us-gaap:CorporateDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Bond Securities [Member] `us-gaap:USTreasuryBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Treasury and Government Short-term Debt Securities [Member] `us-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
US Government Agencies Short-term Debt Securities [Member] `us-gaap:USGovernmentAgenciesShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Municipal Bonds [Member] `us-gaap:MunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Taxable Municipal Bonds [Member] `us-gaap:TaxableMunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Nontaxable Municipal Bonds [Member] `us-gaap:NontaxableMunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Municipal Notes [Member] `us-gaap:MunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Taxable Municipal Notes [Member] `us-gaap:TaxableMunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Nontaxable Municipal Notes [Member] `us-gaap:NontaxableMunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Debt Security, Government, Non-US [Member] `us-gaap:ForeignGovernmentDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Foreign Government Short-term Debt Securities [Member] `us-gaap:ForeignGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] `us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] `us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal Housing Administration Certificates and Obligations (FHA) [Member] `us-gaap:FederalHousingAdministrationCertificatesAndObligationsFHAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] `us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] `us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Collateralized Mortgage Obligations [Member] `us-gaap:CollateralizedMortgageObligationsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Asset-backed Securities [Member] `us-gaap:AssetBackedSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Adjustable Rate Loans [Member] `us-gaap:AdjustableRateLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Variable Rate Demand Obligation [Member] `us-gaap:VariableRateDemandObligationMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Loan Participations and Assignments [Member] `us-gaap:LoanParticipationsAndAssignmentsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Bankers Acceptance [Member] `us-gaap:BankersAcceptanceMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Commercial Paper [Member] `us-gaap:CommercialPaperMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Bank Loan Obligations [Member] `us-gaap:BankLoanObligationsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Auction Rate Preferred Securities [Member] `us-gaap:AuctionRatePreferredSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Notes [Member] `us-gaap:SeniorNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Loans [Member] `us-gaap:SeniorLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Subordinated Debt [Member] `us-gaap:SubordinatedDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Public Income Notes [Member] `us-gaap:IncomeNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Deferrable Notes [Member] `us-gaap:DeferrableNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Payment in Kind (PIK) Note [Member] `us-gaap:PaymentInKindPIKNoteMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Unitranche Debt [Member] `us-gaap:UnitrancheDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Subordinated Notes [Member] `us-gaap:SeniorSubordinatedNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Senior Subordinated Loans [Member] `us-gaap:SeniorSubordinatedLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Junior Loans [Member] `us-gaap:JuniorLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Junior Notes [Member] `us-gaap:JuniorNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Junior Subordinated Debt [Member] `us-gaap:JuniorSubordinatedDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Corporate Debt Securities [Member] `us-gaap:CorporateDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
US Treasury Bond Securities [Member] `us-gaap:USTreasuryBondSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
US Treasury and Government Short-term Debt Securities [Member] `us-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
US Government Agencies Short-term Debt Securities [Member] `us-gaap:USGovernmentAgenciesShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Municipal Bonds [Member] `us-gaap:MunicipalBondsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Taxable Municipal Bonds [Member] `us-gaap:TaxableMunicipalBondsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Nontaxable Municipal Bonds [Member] `us-gaap:NontaxableMunicipalBondsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Municipal Notes [Member] `us-gaap:MunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Taxable Municipal Notes [Member] `us-gaap:TaxableMunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Nontaxable Municipal Notes [Member] `us-gaap:NontaxableMunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Debt Security, Government, Non-US [Member] `us-gaap:ForeignGovernmentDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Foreign Government Short-term Debt Securities [Member] `us-gaap:ForeignGovernmentShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] `us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] `us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Federal Housing Administration Certificates and Obligations (FHA) [Member] `us-gaap:FederalHousingAdministrationCertificatesAndObligationsFHAMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] `us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] `us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Collateralized Mortgage Obligations [Member] `us-gaap:CollateralizedMortgageObligationsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Asset-backed Securities [Member] `us-gaap:AssetBackedSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Adjustable Rate Loans [Member] `us-gaap:AdjustableRateLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Variable Rate Demand Obligation [Member] `us-gaap:VariableRateDemandObligationMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Loan Participations and Assignments [Member] `us-gaap:LoanParticipationsAndAssignmentsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Bankers Acceptance [Member] `us-gaap:BankersAcceptanceMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Commercial Paper [Member] `us-gaap:CommercialPaperMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Bank Loan Obligations [Member] `us-gaap:BankLoanObligationsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Auction Rate Preferred Securities [Member] `us-gaap:AuctionRatePreferredSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Senior Notes [Member] `us-gaap:SeniorNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Senior Loans [Member] `us-gaap:SeniorLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Subordinated Debt [Member] `us-gaap:SubordinatedDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Public Income Notes [Member] `us-gaap:IncomeNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Deferrable Notes [Member] `us-gaap:DeferrableNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Payment in Kind (PIK) Note [Member] `us-gaap:PaymentInKindPIKNoteMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Unitranche Debt [Member] `us-gaap:UnitrancheDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Senior Subordinated Notes [Member] `us-gaap:SeniorSubordinatedNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Senior Subordinated Loans [Member] `us-gaap:SeniorSubordinatedLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Junior Loans [Member] `us-gaap:JuniorLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Junior Notes [Member] `us-gaap:JuniorNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Junior Subordinated Debt [Member] `us-gaap:JuniorSubordinatedDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Corporate Debt Securities [Member] `us-gaap:CorporateDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
US Treasury Bond Securities [Member] `us-gaap:USTreasuryBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
US Treasury and Government Short-term Debt Securities [Member] `us-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
US Government Agencies Short-term Debt Securities [Member] `us-gaap:USGovernmentAgenciesShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Municipal Bonds [Member] `us-gaap:MunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
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Municipal Notes [Member] `us-gaap:MunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Taxable Municipal Notes [Member] `us-gaap:TaxableMunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Nontaxable Municipal Notes [Member] `us-gaap:NontaxableMunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Debt Security, Government, Non-US [Member] `us-gaap:ForeignGovernmentDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Foreign Government Short-term Debt Securities [Member] `us-gaap:ForeignGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] `us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] `us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Federal Housing Administration Certificates and Obligations (FHA) [Member] `us-gaap:FederalHousingAdministrationCertificatesAndObligationsFHAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] `us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] `us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Collateralized Mortgage Obligations [Member] `us-gaap:CollateralizedMortgageObligationsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Asset-backed Securities [Member] `us-gaap:AssetBackedSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Adjustable Rate Loans [Member] `us-gaap:AdjustableRateLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Variable Rate Demand Obligation [Member] `us-gaap:VariableRateDemandObligationMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Loan Participations and Assignments [Member] `us-gaap:LoanParticipationsAndAssignmentsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Bankers Acceptance [Member] `us-gaap:BankersAcceptanceMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Commercial Paper [Member] `us-gaap:CommercialPaperMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Bank Loan Obligations [Member] `us-gaap:BankLoanObligationsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
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Senior Notes [Member] `us-gaap:SeniorNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Senior Loans [Member] `us-gaap:SeniorLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Subordinated Debt [Member] `us-gaap:SubordinatedDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Public Income Notes [Member] `us-gaap:IncomeNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Deferrable Notes [Member] `us-gaap:DeferrableNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Payment in Kind (PIK) Note [Member] `us-gaap:PaymentInKindPIKNoteMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Unitranche Debt [Member] `us-gaap:UnitrancheDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
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Junior Notes [Member] `us-gaap:JuniorNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
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Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Bond Securities [Member] `us-gaap:USTreasuryBondSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury and Government Short-term Debt Securities [Member] `us-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Government Agencies Short-term Debt Securities [Member] `us-gaap:USGovernmentAgenciesShorttermDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Municipal Bonds [Member] `us-gaap:MunicipalBondsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Municipal Notes [Member] `us-gaap:MunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Nontaxable Municipal Notes [Member] `us-gaap:NontaxableMunicipalNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] `us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] `us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Asset-backed Securities [Member] `us-gaap:AssetBackedSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Adjustable Rate Loans [Member] `us-gaap:AdjustableRateLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Variable Rate Demand Obligation [Member] `us-gaap:VariableRateDemandObligationMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Loan Participations and Assignments [Member] `us-gaap:LoanParticipationsAndAssignmentsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Bankers Acceptance [Member] `us-gaap:BankersAcceptanceMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Commercial Paper [Member] `us-gaap:CommercialPaperMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Bank Loan Obligations [Member] `us-gaap:BankLoanObligationsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Auction Rate Preferred Securities [Member] `us-gaap:AuctionRatePreferredSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Senior Notes [Member] `us-gaap:SeniorNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Senior Loans [Member] `us-gaap:SeniorLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Subordinated Debt [Member] `us-gaap:SubordinatedDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Public Income Notes [Member] `us-gaap:IncomeNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Deferrable Notes [Member] `us-gaap:DeferrableNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Payment in Kind (PIK) Note [Member] `us-gaap:PaymentInKindPIKNoteMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Unitranche Debt [Member] `us-gaap:UnitrancheDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Senior Subordinated Notes [Member] `us-gaap:SeniorSubordinatedNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Senior Subordinated Loans [Member] `us-gaap:SeniorSubordinatedLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Junior Loans [Member] `us-gaap:JuniorLoansMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Junior Notes [Member] `us-gaap:JuniorNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Junior Subordinated Debt [Member] `us-gaap:JuniorSubordinatedDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Corporate Debt Securities [Member] `us-gaap:CorporateDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Bond Securities [Member] `us-gaap:USTreasuryBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
US Treasury and Government Short-term Debt Securities [Member] `us-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Municipal Bonds [Member] `us-gaap:MunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Nontaxable Municipal Bonds [Member] `us-gaap:NontaxableMunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Municipal Notes [Member] `us-gaap:MunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Nontaxable Municipal Notes [Member] `us-gaap:NontaxableMunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Debt Security, Government, Non-US [Member] `us-gaap:ForeignGovernmentDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Foreign Government Short-term Debt Securities [Member] `us-gaap:ForeignGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] `us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] `us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Asset-backed Securities [Member] `us-gaap:AssetBackedSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Adjustable Rate Loans [Member] `us-gaap:AdjustableRateLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Variable Rate Demand Obligation [Member] `us-gaap:VariableRateDemandObligationMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Loan Participations and Assignments [Member] `us-gaap:LoanParticipationsAndAssignmentsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Bankers Acceptance [Member] `us-gaap:BankersAcceptanceMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Commercial Paper [Member] `us-gaap:CommercialPaperMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Bank Loan Obligations [Member] `us-gaap:BankLoanObligationsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Auction Rate Preferred Securities [Member] `us-gaap:AuctionRatePreferredSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Senior Loans [Member] `us-gaap:SeniorLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Public Income Notes [Member] `us-gaap:IncomeNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Deferrable Notes [Member] `us-gaap:DeferrableNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Payment in Kind (PIK) Note [Member] `us-gaap:PaymentInKindPIKNoteMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
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Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
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US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
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Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
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Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
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Corporate Bond Securities [Member] `us-gaap:CorporateBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Corporate Note Securities [Member] `us-gaap:CorporateNoteSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Convertible Debt Securities [Member] `us-gaap:ConvertibleDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Short-term Debt [Member] `us-gaap:ShortTermDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
US Treasury Securities [Member] `us-gaap:USTreasurySecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
US Treasury Notes Securities [Member] `us-gaap:USTreasuryNotesSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
US Treasury Bond Securities [Member] `us-gaap:USTreasuryBondSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
US Treasury Bill Securities [Member] `us-gaap:USTreasuryBillSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
US Treasury and Government Short-term Debt Securities [Member] `us-gaap:USTreasuryAndGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
US Government Agencies Short-term Debt Securities [Member] `us-gaap:USGovernmentAgenciesShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Municipal Bonds [Member] `us-gaap:MunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Taxable Municipal Bonds [Member] `us-gaap:TaxableMunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Nontaxable Municipal Bonds [Member] `us-gaap:NontaxableMunicipalBondsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Municipal Notes [Member] `us-gaap:MunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Taxable Municipal Notes [Member] `us-gaap:TaxableMunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Nontaxable Municipal Notes [Member] `us-gaap:NontaxableMunicipalNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Debt Security, Government, Non-US [Member] `us-gaap:ForeignGovernmentDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Foreign Government Short-term Debt Securities [Member] `us-gaap:ForeignGovernmentShorttermDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Commodity Index Linked Notes [Member] `us-gaap:CommodityIndexLinkedNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Sovereign Debt Securities [Member] `us-gaap:SovereignDebtSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] `us-gaap:FederalHomeLoanBankCertificatesAndObligationsFHLBMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member] `us-gaap:FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Federal Housing Administration Certificates and Obligations (FHA) [Member] `us-gaap:FederalHousingAdministrationCertificatesAndObligationsFHAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member] `us-gaap:FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Government National Mortgage Association Certificates and Obligations (GNMA) [Member] `us-gaap:GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Collateralized Mortgage Obligations [Member] `us-gaap:CollateralizedMortgageObligationsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Asset-backed Securities [Member] `us-gaap:AssetBackedSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Repurchase Agreements [Member] `us-gaap:RepurchaseAgreementsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Certificates of Deposit [Member] `us-gaap:CertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
EuroDollar Certificates of Deposit [Member] `us-gaap:EuroDollarCertificatesOfDepositMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Adjustable Rate Loans [Member] `us-gaap:AdjustableRateLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Variable Rate Demand Obligation [Member] `us-gaap:VariableRateDemandObligationMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Loan Participations and Assignments [Member] `us-gaap:LoanParticipationsAndAssignmentsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Bankers Acceptance [Member] `us-gaap:BankersAcceptanceMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Commercial Paper [Member] `us-gaap:CommercialPaperMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Bank Loan Obligations [Member] `us-gaap:BankLoanObligationsMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Auction Rate Preferred Securities [Member] `us-gaap:AuctionRatePreferredSecuritiesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Senior Notes [Member] `us-gaap:SeniorNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Senior Loans [Member] `us-gaap:SeniorLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Subordinated Debt [Member] `us-gaap:SubordinatedDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Public Income Notes [Member] `us-gaap:IncomeNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Deferrable Notes [Member] `us-gaap:DeferrableNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Payment in Kind (PIK) Note [Member] `us-gaap:PaymentInKindPIKNoteMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Unitranche Debt [Member] `us-gaap:UnitrancheDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Senior Subordinated Notes [Member] `us-gaap:SeniorSubordinatedNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Senior Subordinated Loans [Member] `us-gaap:SeniorSubordinatedLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Junior Loans [Member] `us-gaap:JuniorLoansMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Junior Notes [Member] `us-gaap:JuniorNotesMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable
Junior Subordinated Debt [Member] `us-gaap:JuniorSubordinatedDebtMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable

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Name	Relation Type	Role
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentHoldings
Investments [Domain] `us-gaap:InvestmentTypeCategorizationMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchased
Investments [Domain] `us-gaap:InvestmentTypeCategorizationMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsSoldNotYetPurchasedInvestmentsSoldNotYetPurchasedTable
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/SummaryOfInvestmentHoldings
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldings
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/OtherThanSecuritiesInvestmentHoldingsInvestmentHoldingsOtherThanSecuritiesTable
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/InvestmentsFederalTaxNote
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/InvestmentsFederalTaxNoteFederalIncomeTaxNoteTable
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	parent-child	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompany
Securities Investment [Member] `us-gaap:SecuritiesInvestmentMember`	domain-member	http://fasb.org/us-gaap/role/disclosure/FinancialServicesInvestmentCompanyInvestmentHoldingsTable