Net Change Contract Holders Funds [Abstract]

NameNetChangeContractHoldersFundsAbstract
Namespacehttp://fasb.org/us-gaap/2020-01-31
Prefixus-gaap
Data typexbrli:stringItemType
Period typeduration
Substitution Groupxbrli:item
BalanceNone
NillableTrue
AbstractTrue

Labels

TextLangRoleContainer role
Net Change Contract Holders Funds [Abstract]en-UShttp://www.xbrl.org/2003/role/labelhttp://www.xbrl.org/2003/role/link

Related Child Concepts

NameRelation TypeRole
us-gaap:AdditionsToContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperations
us-gaap:WithdrawalFromContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperations
us-gaap:NetChangeContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperations
us-gaap:AdditionsToContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperationsStatementTable
us-gaap:WithdrawalFromContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperationsStatementTable
us-gaap:NetChangeContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectDepositBasedOperationsStatementTable
us-gaap:AdditionsToContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperations
us-gaap:WithdrawalFromContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperations
us-gaap:NetChangeContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperations
us-gaap:AdditionsToContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperationsStatementTable
us-gaap:WithdrawalFromContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperationsStatementTable
us-gaap:NetChangeContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectInvestmentBasedOperationsStatementTable
us-gaap:AdditionsToContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperations
us-gaap:WithdrawalFromContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperations
us-gaap:NetChangeContractHoldersFunds
parent-childhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperations
us-gaap:AdditionsToContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperationsStatementTable
us-gaap:WithdrawalFromContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperationsStatementTable
us-gaap:NetChangeContractHoldersFunds
domain-memberhttp://fasb.org/us-gaap/role/statement/StatementOfCashFlowsIndirectSecuritiesBasedOperationsStatementTable