Receivables Held for Sale - Summary of Activity in Receivables Held for Sale (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Receivables Held-for-sale [Abstract]
Valuation allowance	$ 309	$ 898	$ 1,452

Loans and Leases Receivable Held for Sale Valuation Allowance

No definition available.

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