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Receivables - Retrospective Review of Trouble Debt Restructuring (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
New TDR Loan Volumes In The Period [Abstract]    
Modifications, primarily interest rate modifications $ 60hsbcfc_FinancingReceivableModificationsInterestRateModifications $ 84hsbcfc_FinancingReceivableModificationsInterestRateModifications
Re-age of past due account 91hsbcfc_FinancingReceivableModificationsReAges 188hsbcfc_FinancingReceivableModificationsReAges
Total $ 151hsbcfc_FinancingReceivableModificationsAmount $ 272hsbcfc_FinancingReceivableModificationsAmount