Receivables Held For Sale - Allowance for Credit Losses Rollforward (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 329	$ 1,452	$ 0
Initial valuation allowance for real estate secured receivables transferred to held for sale during the period	113	212	1,547
Release of valuation allowance resulting from improvements in fair value	(314)	(748)	(18)
Valuation allowance on real estate secured receivables transferred to held for investment	(10)	0	0
Change in valuation allowance for loans sold	149	(183)	0
Change in valuation allowance for collections, charged-off, transferred to REO or short sale	(267)	(404)	(77)
Balance at end of period	$ 0	$ 329	$ 1,452

Allowance for Loan and Lease Losses Held-for-Sale, Fair Value Adjustments

No definition available.

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

Allowance for Loan and Lease Losses Held-for-Sale, Transfer Made to Held-for-Sale Loans, Adjustment

No definition available.

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

Allowance for Loan and Leases Held-For-Sale, Transfers to Held-For-Investment

No definition available.

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

Allowance for Loans and Lease Losses Held-for-Sale, Period Increase (Decrease) to Valuation Allowance for Loans Sold

No definition available.

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

Allowance for Loans and Lease Losses Held-for-Sale, Recovery of Bad Debts, Write-offs, Transfers

No definition available.

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

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

Name:	us-gaap_AllowanceForLoanAndLeaseLossesRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration