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Receivables - Receivables Classified as Troubled Debt Restructuring Loan (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Receivables classified as Trouble Debt Restructuring Loans    
TDR loans that became delinquent during the period $ 66hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod $ 175hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod
First Lien [Member]    
Receivables classified as Trouble Debt Restructuring Loans    
TDR loans that became delinquent during the period 55hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_FirstMortgageMember		 142hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_FirstMortgageMember
Second Lien [Member]    
Receivables classified as Trouble Debt Restructuring Loans    
TDR loans that became delinquent during the period 9hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_SecondMortgageMember		 17hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod
/ us-gaap_FinancingReceivableTroubledDebtRestructuringAxis
= us-gaap_SecondMortgageMember
Receivables Held For Sale [Member] | Real Estate Secured [Member]    
Receivables classified as Trouble Debt Restructuring Loans    
TDR loans that became delinquent during the period $ 2hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hsbcfc_ReceivablesHeldForSaleMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hsbcfc_RealEstateSecuredMember		 $ 16hsbcfc_FinancingReceivableDelinquentRecordedInvestmentDuringPeriod
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= hsbcfc_ReceivablesHeldForSaleMember
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= hsbcfc_RealEstateSecuredMember