XML 114 R120.htm IDEA: XBRL DOCUMENT v2.4.1.9
Fair Value Measurements - Changes in Fair Value of Level 3 Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance $ 3,504us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 3,150us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Fair Value Assets, Purchases 8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases 553us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
Fair Value Assets, Settlements (39)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements (29)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3 4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Fair Value Assets, Transfers Out of Level 3 (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3 11us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Fair Value Assets, Ending Balance 3,498us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue 3,690us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Fair Value Assets, Current Period Unrealized Gains (Losses) (13)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss (30)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Beginning Balance (2,615)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue (3,234)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Fair Value Liability, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
Fair Value Liability, Issuances (176)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues (68)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
Fair Value Liability, Settlements 128us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements 214us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
Fair Value Liability, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3 (68)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
Fair Value Liability, Transfers Out of Level 3 121us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3 211us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
Fair Value Liability, Ending Balance (2,568)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue (2,976)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
Fair Value Liability, Current Period Unrealized Gains (Losses) (19)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss (25)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
Interest rate contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Fair Value Assets, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Fair Value Assets, Settlements 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Fair Value Assets, Transfers Out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Fair Value Assets, Ending Balance 20us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Fair Value Assets, Current Period Unrealized Gains (Losses) 20us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1] 0us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember		 [1]
Foreign exchange contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] 95us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Fair Value Assets, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Fair Value Assets, Settlements 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] (6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Fair Value Assets, Transfers Out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] 6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Fair Value Assets, Ending Balance 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] 96us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Fair Value Assets, Current Period Unrealized Gains (Losses) 0us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1] 1us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember		 [1]
Equity contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance 42us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] 3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Fair Value Assets, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Fair Value Assets, Settlements (21)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] (7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] 4us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Fair Value Assets, Transfers Out of Level 3 (1)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] 5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Fair Value Assets, Ending Balance 43us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] 24us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Fair Value Assets, Current Period Unrealized Gains (Losses) 14us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1] 12us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember		 [1]
Precious metals contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance   (2)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Fair Value Assets, Purchases   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Fair Value Assets, Issuances   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Fair Value Assets, Settlements   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Fair Value Assets, Transfers Into Level 3   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Fair Value Assets, Transfers Out of Level 3   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Fair Value Assets, Ending Balance   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Fair Value Assets, Current Period Unrealized Gains (Losses)   0us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember		 [1]
Credit contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance 210us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] 191us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Fair Value Assets, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Fair Value Assets, Settlements (6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] 3us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Fair Value Assets, Transfers Out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Fair Value Assets, Ending Balance 192us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] 181us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Fair Value Assets, Current Period Unrealized Gains (Losses) (40)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1] (28)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember		 [1]
Collateralized debt obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance 253us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 254us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value Assets, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value Assets, Settlements (8)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 (3)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value Assets, Transfers Out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value Assets, Ending Balance 254us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 258us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Fair Value Assets, Current Period Unrealized Gains (Losses) 7us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 7us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember
Corporate and other domestic [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance 2,840us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 2,260us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value Assets, Purchases 8us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 553us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value Assets, Settlements 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value Assets, Transfers Out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value Assets, Ending Balance 2,848us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 2,808us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Fair Value Assets, Current Period Unrealized Gains (Losses) 0us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 (6)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember
Government debt securities issued by foreign entities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance   121us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fair Value Assets, Purchases   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fair Value Assets, Issuances   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fair Value Assets, Settlements   (6)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fair Value Assets, Transfers Into Level 3   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fair Value Assets, Transfers Out of Level 3   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fair Value Assets, Ending Balance   117us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Fair Value Assets, Current Period Unrealized Gains (Losses)   (4)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember
Mortgage servicing rights [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Beginning Balance 159us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] 227us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Fair Value Assets, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPurchases
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Fair Value Assets, Issuances 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Fair Value Assets, Settlements (4)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] (10)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSettlements
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Fair Value Assets, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Fair Value Assets, Transfers Out of Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Fair Value Assets, Ending Balance 141us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] 205us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Fair Value Assets, Current Period Unrealized Gains (Losses) (14)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2] (12)us-gaap_FairValueAssetsMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember		 [2]
Deposits [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Beginning Balance (1,968)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 (2,334)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Fair Value Liability, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Fair Value Liability, Issuances (89)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 (25)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Fair Value Liability, Settlements 49us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 167us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Fair Value Liability, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 (68)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Fair Value Liability, Transfers Out of Level 3 101us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 140us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Fair Value Liability, Ending Balance (1,926)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 (2,244)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Fair Value Liability, Current Period Unrealized Gains (Losses) (13)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 (23)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember		 [3]
Long-term debt [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Beginning Balance (647)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 (900)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Fair Value Liability, Purchases 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Fair Value Liability, Issuances (87)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 (43)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityIssues
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Fair Value Liability, Settlements 79us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 47us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Fair Value Liability, Transfers Into Level 3 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersIntoLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Fair Value Liability, Transfers Out of Level 3 20us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 71us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationLiabilityTransfersOutOfLevel3
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Fair Value Liability, Ending Balance (642)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 (732)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Fair Value Liability, Current Period Unrealized Gains (Losses) (6)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 (2)us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisChangeInUnrealizedGainLoss
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember		 [3]
Trading Gain (Loss) [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 39us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [4] 13us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [4]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [4] (31)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [4]
Trading Gain (Loss) [Member] | Interest rate contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 19us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4]
Trading Gain (Loss) [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4] 1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4]
Trading Gain (Loss) [Member] | Equity contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 23us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4] 19us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4]
Trading Gain (Loss) [Member] | Precious metals contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue   2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4]
Trading Gain (Loss) [Member] | Credit contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue (12)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4] (13)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [1],[4]
Trading Gain (Loss) [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 9us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 [4] 7us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 [4]
Trading Gain (Loss) [Member] | Corporate and other domestic [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 [4] (5)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 [4]
Trading Gain (Loss) [Member] | Government debt securities issued by foreign entities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue   2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		 [4]
Trading Gain (Loss) [Member] | Mortgage servicing rights [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [2],[4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [2],[4]
Trading Gain (Loss) [Member] | Deposits [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [2],[4] (124)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [3],[4]
Trading Gain (Loss) [Member] | Long-term debt [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [2],[4] 93us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_TradingGainLossMember		 [3],[4]
Other Income [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue (13)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [4] (12)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [4]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Gains (Losses) Included In Revenue (26)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [4]
Other Income [Member] | Interest rate contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 1us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4]
Other Income [Member] | Foreign exchange contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4]
Other Income [Member] | Equity contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4]
Other Income [Member] | Precious metals contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4]
Other Income [Member] | Credit contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [1],[4]
Other Income [Member] | Collateralized debt obligations [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 [4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CollateralizedDebtObligationsMember		 [4]
Other Income [Member] | Corporate and other domestic [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 [4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DomesticCorporateDebtSecuritiesMember		 [4]
Other Income [Member] | Government debt securities issued by foreign entities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue   0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_ForeignGovernmentDebtSecuritiesMember		 [4]
Other Income [Member] | Mortgage servicing rights [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Assets, Gains (Losses) Included In Revenue (14)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [2],[4] (12)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [2],[4]
Other Income [Member] | Deposits [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Gains (Losses) Included In Revenue (19)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [2],[4] 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_DepositsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [3],[4]
Other Income [Member] | Long-term debt [Member]    
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair Value Liability, Gains (Losses) Included In Revenue $ (7)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [2],[4] $ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_OtherIncomeMember		 [3],[4]
[1] Level 3 net derivatives included derivative assets of $463 million and derivative liabilities of $208 million as of March 31, 2015 and derivative assets of $694 million and derivative liabilities of $392 million as of March 31, 2014.
[2] See Note 7, "Intangible Assets," for additional information.
[3] See Note 10, "Fair Value Option," for additional information.
[4] Includes realized and unrealized gains and losses.