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Accumulated Other Comprehensive Income (Loss) - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Equity [Abstract]      
Tax (benefit) expense included in net unrealized gains (losses) $ 159us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ (617)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 136us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Tax included in reclassification (48)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (81)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax (60)us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Tax included in amortization 3hsbcusa_OtherComprehensiveIncomeLossAmortizationofUnrealizedLossonTransfersfromAvailableforSaletoHeldtoMaturitySecuritiesTax 0hsbcusa_OtherComprehensiveIncomeLossAmortizationofUnrealizedLossonTransfersfromAvailableforSaletoHeldtoMaturitySecuritiesTax  
Other than Temporary impairment losses, Tax (benefit) 0hsbcusa_OTTILossesInvestmentsPortioninOtherComprehensiveLossTaxIncludingPortionAttributabletoNoncontrollingInterestHeldtomaturitySecuritiesDuetoConsolidationofaVIE (47)hsbcusa_OTTILossesInvestmentsPortioninOtherComprehensiveLossTaxIncludingPortionAttributabletoNoncontrollingInterestHeldtomaturitySecuritiesDuetoConsolidationofaVIE 0hsbcusa_OTTILossesInvestmentsPortioninOtherComprehensiveLossTaxIncludingPortionAttributabletoNoncontrollingInterestHeldtomaturitySecuritiesDuetoConsolidationofaVIE
Tax included in reclassification due to accretion 7hsbcusa_OtherthanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentofNoncreditPortionTaxHeldtomaturitySecurities 4hsbcusa_OtherthanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentofNoncreditPortionTaxHeldtomaturitySecurities 0hsbcusa_OtherthanTemporaryImpairmentLossesInvestmentsReclassificationAdjustmentofNoncreditPortionTaxHeldtomaturitySecurities
Tax included in reclassification due to closure of VIE 36hsbcusa_AdjustmentToReverseOtherThanTemporaryImpairmentOnSecuritiesHeldToMaturityDueToClosureOfVariableInterestEntityTax 0hsbcusa_AdjustmentToReverseOtherThanTemporaryImpairmentOnSecuritiesHeldToMaturityDueToClosureOfVariableInterestEntityTax 0hsbcusa_AdjustmentToReverseOtherThanTemporaryImpairmentOnSecuritiesHeldToMaturityDueToClosureOfVariableInterestEntityTax
Tax (benefit) expense included in net unrealized gains (losses) (48)us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 78us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax 10us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax
Tax included in reclassification 2us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax 4us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax 7us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax
Tax (benefit) included in change in unfunded pension postretirement liability (4)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax 5us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax 4us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax $ 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax $ 0us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax $ 1us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansTax