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GM Financial Receivables and Transactions Commercial Finance Receivables Credit Quality Indicators (Details) - GM Financial [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	$ 48,418	$ 42,671
Commercial Finance Receivables [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	10,668	9,957
Commercial Finance Receivables [Member] | Group I - Dealers with superior financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	2,077	1,915
Commercial Finance Receivables [Member] | Group II - Dealers with strong financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	3,905	3,465
Commercial Finance Receivables [Member] | Group III - Dealers with fair financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	3,197	3,239
Commercial Finance Receivables [Member] | Group IV - Dealers with weak financial metrics [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	960	997
Commercial Finance Receivables [Member] | Group V - Dealers warranting special mention due to potential weaknesses [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	422	260
Commercial Finance Receivables [Member] | Group VI - Dealers with loans classified as substandard, doubtful or impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
GM Financial receivables	$ 107	$ 81

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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://fasb.org/us-gaap/role/ref/legacyRef
-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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