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Fair Value Option - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fair Value Disclosures [Abstract]      
Change in debt balance from foreign currency translation adjustment $ (146)hsbcfc_IncreaseDecreaseinDebtBalancefromForeignCurrencyTranslationAdjustment $ 245hsbcfc_IncreaseDecreaseinDebtBalancefromForeignCurrencyTranslationAdjustment  
Foreign currency translation gains (losses) recorded in derivatives 391hsbcfc_ForeignCurrencyTranslationGainsLossesRecordedInDerivativeRelatedIncomeExpenseAssociatedWithDebtDesignatedAtFairValue (73)hsbcfc_ForeignCurrencyTranslationGainsLossesRecordedInDerivativeRelatedIncomeExpenseAssociatedWithDebtDesignatedAtFairValue (35)hsbcfc_ForeignCurrencyTranslationGainsLossesRecordedInDerivativeRelatedIncomeExpenseAssociatedWithDebtDesignatedAtFairValue
Offsetting gains (losses) recorded in derivative related income (expense) (391)hsbcfc_OffsettingGainsLossesRecordedInDerivativeRelatedIncomeExpenseAssociatedWithRelatedDerivatives 73hsbcfc_OffsettingGainsLossesRecordedInDerivativeRelatedIncomeExpenseAssociatedWithRelatedDerivatives 35hsbcfc_OffsettingGainsLossesRecordedInDerivativeRelatedIncomeExpenseAssociatedWithRelatedDerivatives
Cumulative increased value of debt through fair value option adjustments $ 386hsbcfc_CumulativeIncreasedValueOfDebtThroughFairValueOptionAdjustments $ 581hsbcfc_CumulativeIncreasedValueOfDebtThroughFairValueOptionAdjustments