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Accumulated Other Comprehensive Income (Loss) - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Equity [Abstract]    
Tax (benefit) expense included in net unrealized gains (losses) $ (11)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 93us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Tax included in reclassification (9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (9)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Tax included in amortization 3hsbcusa_OtherComprehensiveIncomeLossAmortizationofUnrealizedLossonTransfersfromAvailableforSaletoHeldtoMaturitySecuritiesTax 0hsbcusa_OtherComprehensiveIncomeLossAmortizationofUnrealizedLossonTransfersfromAvailableforSaletoHeldtoMaturitySecuritiesTax
Tax included in reclassification due to accretion 0hsbcusa_OtherthanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentofNoncreditPortionTaxHeldtomaturitySecurities 1hsbcusa_OtherthanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentofNoncreditPortionTaxHeldtomaturitySecurities
Tax (benefit) expense included in net unrealized gains (losses) (12)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax (13)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Tax included in reclassification 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
Tax (benefit) included in change in unfunded pension postretirement liability (less than $1 million) $ 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax $ 0us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax