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GM Financial Receivables Commercial Finance Receivables Credit Quality Indicators (Details) - GM Financial [Member] - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	$ 42,671	$ 33,933
Commercial Finance Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	9,957	7,533
Commercial Finance Receivables [Member] | Group I Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	1,915	1,372
Commercial Finance Receivables [Member] | Group II Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	3,465	2,526
Commercial Finance Receivables [Member] | Group III Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	3,239	2,598
Commercial Finance Receivables [Member] | Group IV Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	997	613
Commercial Finance Receivables [Member] | Group V Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	260	334
Commercial Finance Receivables [Member] | Group VI Dealers [Member]
Financing Receivable, Recorded Investment [Line Items]
Finance Receivables	$ 81	$ 90

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- 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

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