Summary Of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies [Line Items]
Intercompany Receivable	$ 40,859,000	$ 37,447,000
Intercompany Subvention Receivable	19,000,000	37,400,000
Intercompany Receivable - Commercial Lending	$ 21,800,000

Total amount due to the entity, as of the balance sheet date, from the Parent Company as a result of an agreement with the Parent Company to provide cash payments to the entity to offer lower interest rates on finance and lease contracts.

No definition available.

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