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Fair Value Option - Components of Gain (Loss) on Instruments at Fair Value and Related Derivatives (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Mark-to-market on the related derivatives $ 388us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet $ 214us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Gain (loss) on instruments designated at fair value and related derivatives 85hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative 28hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components (370)hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1] (235)hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1]
Credit risk component, total 89hsbcusa_FairValueOptionCreditRiskGainsLossesNet
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3] 45hsbcusa_FairValueOptionCreditRiskGainsLossesNet
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3]
Total mark-to-market on financial instruments designated at fair value (281)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 (190)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Net realized loss on the financial instruments 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Mark-to-market on the related derivatives 349us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 201us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Net Realized Gain Losses On Related Long Term Debt Derivatives 17hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 17hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Gain (loss) on instruments designated at fair value and related derivatives 85hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 28hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Loans [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components 0hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1] 0hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1]
Credit risk component, assets (10)us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3] 0us-gaap_FairValueOptionCreditRiskGainsLossesOnAssets
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3]
Total mark-to-market on financial instruments designated at fair value (10)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Net realized loss on the financial instruments 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Mark-to-market on the related derivatives 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Net Realized Gain Losses On Related Long Term Debt Derivatives 0hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Gain (loss) on instruments designated at fair value and related derivatives (10)hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_LoansReceivableMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Long-term debt [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components (82)hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1] (82)hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1]
Credit risk component, liabilities 70us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3] 19us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3]
Total mark-to-market on financial instruments designated at fair value (12)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 (63)us-gaap_FairValueOptionChangesInFairValueGainLoss1
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Net realized loss on the financial instruments 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Mark-to-market on the related derivatives 70us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 70us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Net Realized Gain Losses On Related Long Term Debt Derivatives 17hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 17hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Gain (loss) on instruments designated at fair value and related derivatives 75hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 24hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_BorrowingsMember
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= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember
Gain (Loss) on Instruments Designated at Fair Value and Related Derivatives [Member] | Hybrid Instrument [Member]    
Components Of Gain On Instruments At Fair Value And Related Derivatives [Line Items]    
Interest rate and other components (288)hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_HybridInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1] (153)hsbcusa_FairValueOptionInterestRateandOtherComponentsGainsLosses
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_HybridInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [1]
Credit risk component, liabilities 29us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
/ us-gaap_EligibleItemOrGroupForFairValueOptionAxis
= us-gaap_HybridInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3] 26us-gaap_FairValueOptionCreditRiskGainsLossesOnLiabilities
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= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 [2],[3]
Total mark-to-market on financial instruments designated at fair value (259)us-gaap_FairValueOptionChangesInFairValueGainLoss1
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= us-gaap_HybridInstrumentMember
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= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 (127)us-gaap_FairValueOptionChangesInFairValueGainLoss1
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Net realized loss on the financial instruments 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
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= us-gaap_HybridInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0hsbcusa_NetRealizedGainsLossesOnFinancialInstrument
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Mark-to-market on the related derivatives 279us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 131us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
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Net Realized Gain Losses On Related Long Term Debt Derivatives 0hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
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= us-gaap_HybridInstrumentMember
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= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 0hsbcusa_NetRealizedGainLossesOnRelatedLongTermDebtDerivatives
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Gain (loss) on instruments designated at fair value and related derivatives $ 20hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
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= us-gaap_HybridInstrumentMember
/ us-gaap_IncomeStatementLocationAxis
= hsbcusa_GainlossonInstrumentsDesignatedatFairValueandRelatedDerivativesMember		 $ 4hsbcusa_GainLossOnInstrumentsDesignatedAtFairValueAndRelatedDerivative
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[1] As it relates to hybrid instruments, interest rate and other components includes interest rate, foreign exchange and equity contract risks.
[2] During the first quarter of 2015 and 2014, the gains in the credit risk component for long-term debt were attributable to the widening of our own credit spreads
[3] During the first quarter of 2015, the gain in the credit risk component for hybrid instruments is attributable primarily to the widening of our own credit spreads related to structured notes while the gain during the first quarter of 2014 was attributable primarily to the widening of our own credit spreads related to structured notes partially offset by the tightening of credit spreads on structured deposits.