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Long-Term Debt - Additional Information (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Debt Instrument [Line Items]        
Cumulative carrying value adjustments on derivative financial instruments $ 8,000,000hsbcfc_LongTermDebtCumulativeCarryingValueAdjustmentsDerivativeFinancialInstruments $ 5,000,000hsbcfc_LongTermDebtCumulativeCarryingValueAdjustmentsDerivativeFinancialInstruments    
Change in carrying value of foreign debt resulting from translation adjustments 189,000,000hsbcfc_ChangeInCarryingValueOfForeignDenominatedLongTermDebtResultingFromForeignCurrencyTranslationAdjustments 484,000,000hsbcfc_ChangeInCarryingValueOfForeignDenominatedLongTermDebtResultingFromForeignCurrencyTranslationAdjustments    
Long-term debt carried at fair value 6,762,000,000us-gaap_LongTermDebtFairValue 8,025,000,000us-gaap_LongTermDebtFairValue    
Interest Expense for long-term debt for continuing operations 836,000,000us-gaap_InterestExpenseLongTermDebt 1,141,000,000us-gaap_InterestExpenseLongTermDebt 1,585,000,000us-gaap_InterestExpenseLongTermDebt  
Weighted average interest rate on long-term debt 4.69%us-gaap_LongtermDebtWeightedAverageInterestRate 4.35%us-gaap_LongtermDebtWeightedAverageInterestRate    
Long-term debt collateralized by receivables 1,489,000,000hsbcfc_LongTermDebtCollateralizedByReceivable 2,200,000,000hsbcfc_LongTermDebtCollateralizedByReceivable    
Loans pledged as collateral 2,999,000,000us-gaap_LoansPledgedAsCollateral 4,020,000,000us-gaap_LoansPledgedAsCollateral    
Senior Notes [Member]        
Debt Instrument [Line Items]        
Repurchased face amount   102,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
  512,000,000us-gaap_DebtInstrumentRepurchasedFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
Trust Preferred Securities Subject to Mandatory Redemption [Member]        
Debt Instrument [Line Items]        
Loan agreements with affiliates 1,000,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
     
Preferred Stock callable at par (usd per share) $ 25us-gaap_PreferredStockRedemptionPricePerShare
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
     
Preferred Securities have a liquidation value per preferred security (usd per share) $ 25us-gaap_PreferredStockLiquidationPreference
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_TrustPreferredSecuritiesSubjectToMandatoryRedemptionMember
     
Revolving Credit Facility [Member] | Amended Credit Agreement Maturing September 2017 [Member] | HSBC USA, Inc. [Member]        
Debt Instrument [Line Items]        
Long-term debt due to affiliate 512,000,000us-gaap_DueToAffiliateNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_AmendedCreditAgreementMaturingSeptember2017Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember
     
Revolving Credit Facility [Member] | Amended Credit Agreement [Member] | HSBC USA, Inc. [Member]        
Debt Instrument [Line Items]        
Long-term debt due to affiliate   $ 512,000,000us-gaap_DueToAffiliateNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_AmendedCreditAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember