Troubled Debt Restructures and Nonperforming Receivables - Additional Information Related to TDR Loans (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Receivables [Abstract]
Total average balance of TDR Loans	$ 1,453	$ 7,525
Total interest income recognized on TDR Loans	$ 20	$ 157

Financing receivable modifications average recorded investment.

No definition available.

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Namespace Prefix:	hsbcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration