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GM Financial Receivables and Transactions - Commercial Finance Receivables Credit Quality Indicators (Details) - GM Financial - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	$ 53,900	$ 52,844
Commercial Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	11,671	12,276
Commercial Finance Receivables | Group I Dealers
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	1,942	2,192
Commercial Finance Receivables | Group II Dealers
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	4,552	4,399
Commercial Finance Receivables | Group III Dealers
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	3,711	4,064
Commercial Finance Receivables | Group IV Dealers
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	968	1,116
Commercial Finance Receivables | Group V Dealers
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	370	422
Commercial Finance Receivables | Group VI Dealers
Financing Receivable, Credit Quality Indicator [Line Items]
Finance Receivables	$ 128	$ 83

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+ References

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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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