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Related Party Transactions - Additional Information (Detail) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2010
Dec. 31, 2014
Nov. 30, 2013
Related Party Transaction [Line Items]          
General term of securities purchased under an agreement to resell 120 days        
Due to affiliates $ 6,945,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent     $ 6,945,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent  
Long-term debt 15,407,000,000us-gaap_LongTermDebt     16,427,000,000us-gaap_LongTermDebt  
Notional values of derivative contracts 13,980,000,000invest_DerivativeNotionalAmount     13,980,000,000invest_DerivativeNotionalAmount  
Fair value of our agreements with affiliate counterparties required the affiliate to provide collateral 728,000,000us-gaap_CollateralAlreadyPostedAggregateFairValue     213,000,000us-gaap_CollateralAlreadyPostedAggregateFairValue  
Interest bearing deposits with banks 2,001,000,000us-gaap_InterestBearingDepositsInBanks     2,000,000,000us-gaap_InterestBearingDepositsInBanks  
HSBC USA, Inc. [Member]          
Related Party Transaction [Line Items]          
Due to affiliates 3,012,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		     3,012,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		  
HSBC USA, Inc. [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Debt instrument, term 364 days        
Maximum maturity period for borrowings 5 years        
HSBC North America [Member]          
Related Party Transaction [Line Items]          
Due to affiliates 600,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		     600,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		  
Annual fee to guarantor 2,000,000hsbcfc_DuetoRelatedPartyAnnualFeetoGuarantor
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		 1,000,000hsbcfc_DuetoRelatedPartyAnnualFeetoGuarantor
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		      
HSBC North America [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Borrowing capacity of credit facility 455,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		     455,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		  
HSBC affiliates [Member]          
Related Party Transaction [Line Items]          
Due to affiliates 6,945,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember		 [1]     6,945,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember		 [1]  
Interest bearing deposits with banks 2,001,000,000us-gaap_InterestBearingDepositsInBanks
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember		     2,000,000,000us-gaap_InterestBearingDepositsInBanks
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_SubsidiaryOfCommonParentMember		  
Hsbc Investments [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Debt instrument, term 364 days        
HSBC USA Inc [Member]          
Related Party Transaction [Line Items]          
Receivables services to affiliates 804,000,000hsbcfc_ReceivablesServicedToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		     837,000,000hsbcfc_ReceivablesServicedToAffiliates
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= us-gaap_AffiliatedEntityMember		  
Series C Preferred Stock [Member]          
Related Party Transaction [Line Items]          
Number of shares of stock issued (shares)     1,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		    
Value of issued stock     1,000,000,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		    
Dividend paid on preferred stock 22,000,000us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		 22,000,000us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember		      
Amended Credit Agreement [Member] | HSBC USA, Inc. [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Borrowing capacity of credit facility 5,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_AmendedCreditAgreementMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		        
Amended Credit Agreement Maturing September 2017 [Member] | HSBC USA, Inc. [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [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		        
Amended Credit Agreement Maturing January 2018 [Member] | HSBC USA, Inc. [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Due to affiliates 1,500,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_AmendedCreditAgreementMaturingJanuary2018Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		        
Amended Credit Agreement Maturing September 2018 [Member] | HSBC USA, Inc. [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Due to affiliates 1,000,000,000us-gaap_DueToRelatedPartiesCurrentAndNoncurrent
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_AmendedCreditAgreementMaturingSeptember2018Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		        
Maturing May 2017 [Member] | HSBC USA, Inc. [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Borrowing capacity of credit facility 1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_MaturingMay2017Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		     1,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_MaturingMay2017Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		  
Amount of credit facility outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_MaturingMay2017Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		     0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_MaturingMay2017Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcUsaIncMember		  
Maturing January 2015 [Member] | HSBC North America [Member] | Revolving Credit Facility [Member]          
Related Party Transaction [Line Items]          
Amount of credit facility outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_MaturingJanuary2015Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		     0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
/ us-gaap_DebtInstrumentAxis
= hsbcfc_MaturingJanuary2015Member
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		  
HSBC Bank USA [Member]          
Related Party Transaction [Line Items]          
Notional values of derivative contracts 14,000,000,000invest_DerivativeNotionalAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		     14,000,000,000invest_DerivativeNotionalAmount
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember		  
Subordinated Debt [Member] | Public Subordinated Debt Issue Maturing 2021 [Member]          
Related Party Transaction [Line Items]          
Long-term debt 3,000,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hsbcfc_PublicSubordinatedDebtIssueMaturing2021Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SubordinatedDebtMember		        
Delayed Draw Term Loan [Member] | HSBC North America [Member]          
Related Party Transaction [Line Items]          
Loan agreements with affiliates 600,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= hsbcfc_DelayedDrawTermLoanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		        
Number of draws allowed 3hsbcfc_DebtInstrumentNumberOfDrawsAllowedUnderFundingAgreement
/ us-gaap_LongtermDebtTypeAxis
= hsbcfc_DelayedDrawTermLoanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		        
Amount per draw 200,000,000hsbcfc_LongTermDebtTermLoanAmountPerDraw
/ us-gaap_LongtermDebtTypeAxis
= hsbcfc_DelayedDrawTermLoanMember
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= hsbcfc_HsbcNorthAmericaMember		        
Delayed Draw Term Loan [Member] | Minimum [Member] | HSBC North America [Member]          
Related Party Transaction [Line Items]          
Maturity year of long term debt 2034        
Delayed Draw Term Loan [Member] | Maximum [Member] | HSBC North America [Member]          
Related Party Transaction [Line Items]          
Maturity year of long term debt 2035        
Securities Litigation [Member]          
Related Party Transaction [Line Items]          
Amount of surety bond         $ 2,500,000,000hsbcfc_SuretyBondAmount
/ us-gaap_LitigationStatusAxis
= hsbcfc_SecuritiesLitigationMember
[1] Due to affiliates includes amounts owed to HSBC and its subsidiaries as a result of direct debt issuances as well as HSBC's ownership of our subordinated debt and excludes preferred stock.