Troubled Debt Restructures and Nonperforming Receivables - Additional Information Related to TDR Loans (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Receivables [Abstract]
Average balance of TDR Loans	$ 1,046	$ 5,654	$ 1,250	$ 6,589
Interest income recognized on TDR Loans	$ 13	$ 93	$ 33	$ 250

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