 | us-gaap:AssetsFairValueDisclosureRecurring | dep-dimensionallyQualifiedConcept-deprecatedConcept | http://fasb.org/us-gaap/role/deprecated/deprecated |
 | us-gaap:AssetsFairValueDisclosureNonrecurring | dep-dimensionallyQualifiedConcept-deprecatedConcept | http://fasb.org/us-gaap/role/deprecated/deprecated |
 | us-gaap:AvailableForSaleSecuritiesDebtSecurities | summation-item | http://fasb.org/us-gaap/role/disclosure/FairValueMeasuresAndDisclosuresTmp01 |
 | us-gaap:AlternativeInvestment | summation-item | http://fasb.org/us-gaap/role/disclosure/FairValueMeasuresAndDisclosuresTmp01 |
 | us-gaap:DerivativeAssets | summation-item | http://fasb.org/us-gaap/role/disclosure/FairValueMeasuresAndDisclosuresTmp01 |
 | us-gaap:EquitySecuritiesFvNi | summation-item | http://fasb.org/us-gaap/role/disclosure/FairValueMeasuresAndDisclosuresTmp01 |
 | us-gaap:CashAndCashEquivalentsFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:ReceivablesFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:InvestmentsFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:MortgageBackedSecuritiesHeldToMaturityFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:LoansHeldForSaleFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:MortgagesHeldForSaleFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:CashSurrenderValueFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:SecuritiesBorrowedFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:ServicingAssetAtFairValueAmount | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:RetainedInterestFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:DerivativeAssets | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:ForeignCurrencyContractAssetFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:OtherAssetsFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:InventoryNoncurrentFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:PropertyPlantAndEquipmentFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVenturesFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:InvestmentInPhysicalCommoditiesFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:GoodwillFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:IndefiniteLivedIntangibleAssetsExcludingGoodwillFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:FiniteLivedIntangibleAssetsFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:InvestmentsInPowerAndDistributionProjectsFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:AssetsHeldForSaleLongLivedFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:RegulatoryAssetsNoncurrentFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |
 | us-gaap:GasPurchaseContractFairValueDisclosure | summation-item | http://fasb.org/us-gaap/role/disclosure/FinancialInstrumentsFairValueDisclosures |