Supplemental Cash Flow Information Narrative (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Elements [Abstract]
Intercompany Subvention Receivable	$ 61	$ 21	$ 37

he increase (decrease) in the subvention receivable from a related party.

No definition available.

Name:	acf_IncreaseDecreaseInRelatedPartySubventionReceivable
Namespace Prefix:	acf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration