Fair Value Option - Additional Information (Detail) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Cumulative increased value of debt through fair value option adjustments	$ 72	$ 90

Cumulative Increased Value of Debt through Fair Value Option Adjustments

No definition available.

Name:	hsbcfc_CumulativeIncreasedValueOfDebtThroughFairValueOptionAdjustments
Namespace Prefix:	hsbcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant