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GM Financial Receivables and Transactions - Commercial Finance Receivables Credit Quality Indicators (Details) - GM Financial [Member] - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	$ 55,146	$ 52,844
Commercial Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	12,555	12,276
Commercial Finance Receivables [Member] | Group I - Dealers with superior financial metrics [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	1,922	2,192
Commercial Finance Receivables [Member] | Group II - Dealers with strong financial metrics [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	5,102	4,399
Commercial Finance Receivables [Member] | Group III - Dealers with fair financial metrics [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	3,861	4,064
Commercial Finance Receivables [Member] | Group IV - Dealers with weak financial metrics [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	1,141	1,116
Commercial Finance Receivables [Member] | Group V - Dealers warranting special mention due to potential weaknesses [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	419	422
Commercial Finance Receivables [Member] | Group VI - Dealers with loans classified as substandard, doubtful or impaired [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables	$ 110	$ 83

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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, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447

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