Variable Interest Entities - Narrative (Details) - USD ($) $ in Billions	Dec. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Abstract]
Transfers of finance receivables	$ 1.5	$ 2.5
Transfers of finance receivables outstanding balance	$ 1.4	$ 2.4

Transfers of Finance Receivables Outstanding Balance

No definition available.

Name:	acf_TransfersofFinanceReceivablesOutstandingBalance
Namespace Prefix:	acf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant