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Income Taxes - Components of Deferred Provision (Benefit) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
Deferred income tax provision (benefit) (excluding the effects of other components) $ 144hsbcusa_DeferredIncomeTaxProvisionBenefitExcludingEffectsofOtherComponents $ 31hsbcusa_DeferredIncomeTaxProvisionBenefitExcludingEffectsofOtherComponents $ (86)hsbcusa_DeferredIncomeTaxProvisionBenefitExcludingEffectsofOtherComponents
Increase in Federal operating loss carryforwards 1hsbcusa_IncreaseDecreaseinFederalOperatingLossCarryforwards 0hsbcusa_IncreaseDecreaseinFederalOperatingLossCarryforwards 0hsbcusa_IncreaseDecreaseinFederalOperatingLossCarryforwards
Increase in state valuation allowance 11hsbcusa_DeferredIncomeTaxProvisionIncreaseDecreaseinStateValuationAllowance 0hsbcusa_DeferredIncomeTaxProvisionIncreaseDecreaseinStateValuationAllowance 0hsbcusa_DeferredIncomeTaxProvisionIncreaseDecreaseinStateValuationAllowance
(Increase) decrease in foreign and general business tax credits 29hsbcusa_IncreaseDecreaseinForeignandGeneralBusinessTaxCredits (29)hsbcusa_IncreaseDecreaseinForeignandGeneralBusinessTaxCredits 125hsbcusa_IncreaseDecreaseinForeignandGeneralBusinessTaxCredits
Deferred income tax provision (benefit) $ 185us-gaap_DeferredIncomeTaxExpenseBenefit $ 2us-gaap_DeferredIncomeTaxExpenseBenefit $ 39us-gaap_DeferredIncomeTaxExpenseBenefit