Finance Receivables Commercial Finance Receivables (Details) (Commercial Finance Receivables, USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	$ 6,700
Proceeds from Collection of Finance Receivables	377
Financing Receivable, Allowance for Credit Losses, Write-downs	0
Foreign Currency Translation - Finance Receivables	31
Financing Receivable, Gross	7,108
North America Segment [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	1,975	560
Proceeds from Collection of Finance Receivables	223	323
Financing Receivable, Allowance for Credit Losses, Write-downs	0	0
Foreign Currency Translation - Finance Receivables	(8)	0
Financing Receivable, Gross	2,190	883
International Segment [Member]
Accounts Notes And Loans Receivable Rollforward [Roll Forward]
Financing Receivable, Gross	4,725
Proceeds from Collection of Finance Receivables	154
Financing Receivable, Allowance for Credit Losses, Write-downs	0
Foreign Currency Translation - Finance Receivables	39
Financing Receivable, Gross	$ 4,918

Name:	acf_AccountsNotesAndLoansReceivableRollforwardRollForward
Namespace Prefix:	acf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Finance Receivables, Translation Adjustment

+ References

No definition available.

+ Details

Name:	acf_FinanceReceivablesTranslationAdjustment
Namespace Prefix:	acf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10(3))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Subparagraph 3

-Article 9

+ Details

Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow associated with the collection of receivables arising from the financing of goods and services.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromCollectionOfFinanceReceivables
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration