Receivables Held for Sale (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended
Jun. 30, 2012
Summary of components of lower of amortized cost or fair value adjustment
Provision for credit losses	$ 112
Other revenues	1,547
Lower of amortized cost or fair value adjustment	$ 1,659

Lower of Cost or Fair Value Adjustment on Loans Held for Sale Including Credit Component.

No definition available.

Name:	hsbcfc_LowerOfCostOrFairValueAdjustmentOnLoansHeldForSaleIncludingCreditComponent
Namespace Prefix:	hsbcfc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration