XML 64 R83.htm IDEA: XBRL DOCUMENT v2.4.1.9
Derivative Financial Instruments - Fair Value of Derivatives and Balance Offsetting (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Derivatives, Fair Value [Line Items]    
Derivative assets $ 87,068us-gaap_DerivativeFairValueOfDerivativeAsset $ 75,982us-gaap_DerivativeFairValueOfDerivativeAsset
Derivative liabilities 85,022us-gaap_DerivativeFairValueOfDerivativeLiability 74,050us-gaap_DerivativeFairValueOfDerivativeLiability
Netting assets 72,092us-gaap_DerivativeAssetFairValueGrossLiability [1],[2] 63,913us-gaap_DerivativeAssetFairValueGrossLiability [1],[2]
Netting liabilities 72,092us-gaap_DerivativeLiabilityFairValueGrossAsset [1],[2] 63,913us-gaap_DerivativeLiabilityFairValueGrossAsset [1],[2]
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements(5)(6) 6,573us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset [2],[3] 4,811us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset [2],[3]
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements(5)(6) 1,084us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset [2],[3] 1,724us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset [2],[3]
Derivative Asset 8,403us-gaap_DerivativeAssets 7,258us-gaap_DerivativeAssets
Derivative Liability 11,846us-gaap_DerivativeLiabilities 8,413us-gaap_DerivativeLiabilities
Less: Gross amounts of financial instrument collateral received not offset 1,273us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral 1,837us-gaap_DerivativeFairValueOfDerivativeAssetAmountOffsetAgainstCollateral
Less: Gross amounts of financial instrument collateral posted not offset 5,420us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral 4,398us-gaap_DerivativeFairValueOfDerivativeLiabilityAmountOffsetAgainstCollateral
Net amount of derivative asset 7,130hsbcusa_DerivativeAssetNet 5,421hsbcusa_DerivativeAssetNet
Net amount of derivative liability 6,426hsbcusa_DerivativeLiabilityNet 4,015hsbcusa_DerivativeLiabilityNet
Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Less: Gross amounts of cash collateral received subject to enforceable master netting agreements(5)(6) 6,573us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
4,811us-gaap_DerivativeAssetCollateralObligationToReturnCashOffset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Less: Gross amounts of cash collateral posted subject to enforceable master netting agreements(5)(6) 1,084us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
1,724us-gaap_DerivativeLiabilityCollateralRightToReclaimCashOffset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 93us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4] 58us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4]
Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 852us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4] 641us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4]
Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 50,885us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 45,278us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 51,276us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 45,998us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 27,705us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 22,219us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 26,309us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 20,839us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 827us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 1,072us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 676us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 609us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 4,185us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 4,122us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 3,989us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5] 4,018us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
[5]
Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 14us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4] 5us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4]
Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 651us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4] 474us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4]
Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 8us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4] 8us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4]
Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 201us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4] 167us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
[4]
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 22,608us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6] 16,862us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6]
OTC Cleared [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 22,240us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6] 17,557us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6]
OTC Cleared [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 635us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6] 604us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6]
OTC Cleared [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 784us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6] 730us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[5],[6]
OTC Cleared [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 11us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6] 1us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6]
OTC Cleared [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 298us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6] 206us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6]
OTC Cleared [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 8us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6] 8us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6]
OTC Cleared [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 7us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6] 6us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_OtcClearedMember
[4],[6]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 865us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 768us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 114us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 88us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 28,247us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 28,370us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 28,985us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 28,398us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 72us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 44us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 27,683us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 22,219us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 26,262us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 20,826us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 841us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 757us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 157us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 167us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 1,569us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 1,635us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Equity contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 1,568us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 1,632us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_EquityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 5us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 794us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 1,013us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 645us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 591us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 98us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 73us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 9us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 9us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 3,550us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 3,518us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Credit contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 3,205us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6] 3,288us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CreditRiskContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[5],[6]
Bilateral OTC [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 3us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 4us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Fair Value Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 353us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 268us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_FairValueHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 194us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6] 161us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4],[6]
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] | Other assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 71us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4] 45us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4]
Bilateral OTC [Member] | Cash Flow Hedging [Member] | Foreign exchange contracts [Member] | Designated as Hedging Instrument [Member] | Interest taxes and other liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4] 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_InterestTaxesAndOtherLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis
= us-gaap_CashFlowHedgingMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_DesignatedAsHedgingInstrumentMember
/ us-gaap_TransactionTypeAxis
= hsbcusa_BilateralOtcMember
[4]
Exchange Traded [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 30us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6] 46us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6]
Exchange Traded [Member] | Interest rate contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 51us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6] 43us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6]
Exchange Traded [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 22us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6] 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6]
Exchange Traded [Member] | Foreign exchange contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities 47us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6] 13us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6]
Exchange Traded [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative assets 33us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6] 59us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_BalanceSheetLocationAxis
= hsbcusa_TradingAssetsMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6]
Exchange Traded [Member] | Precious metals contracts [Member] | Not Designated as Hedging Instrument [Member] | Trading Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Derivative liabilities $ 31us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6] $ 18us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_TradingLiabilitiesMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_CommodityContractMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember
/ us-gaap_TransactionTypeAxis
= us-gaap_ExchangeTradedMember
[5],[6]
[1] Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable netting agreements.
[2] Netting is performed at a counterparty level in cases where enforceable master netting and credit support agreements are in place, regardless of the type of derivative instrument. Therefore, we have not attempted to allocate netting to the different types of derivative instruments shown in the table above.
[3] Represents the netting of cash collateral posted and received by counterparty under enforceable credit support agreements.
[4] Derivative assets / liabilities related to cash flow hedges, fair value hedges and derivative instruments held for purposes other than for trading are recorded in other assets / interest, taxes and other liabilities on the consolidated balance sheet.
[5] Trading related derivative assets/liabilities are recorded in trading assets/trading liabilities on the consolidated balance sheet.
[6] Over-the-counter (OTC) derivatives include derivatives executed and settled bilaterally with counterparties without the use of an organized exchange or central clearing house. The credit risk associated with bilateral OTC derivatives is managed through master netting agreements and obtaining collateral. OTC-cleared derivatives are executed bilaterally in the OTC market but then novated to a central clearing counterparty, whereby the central clearing counterparty becomes the counterparty to both of the original counterparties. Exchange traded derivatives are executed directly on an organized exchange that provides pre-trade price transparency. Credit risk is minimized for OTC-cleared derivatives and exchange traded derivatives through daily margining required by central clearing counterparties.