Variable Interest Entities - Narrative (Details) - USD ($) $ in Billions	Dec. 31, 2016	Dec. 31, 2015
Noncontrolling Interest [Abstract]
Transfers of finance receivables	$ 1.2	$ 1.5
Transfers of finance receivables outstanding balance	$ 1.1	$ 1.4

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