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GM Financial Receivables and Transactions - Commercial Finance Receivables Credit Quality Indicators (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
GM Financial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables, net of fees	$ 54,234	$ 53,900
Commercial Finance Receivables [Member] | GM Financial [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving	10,921
2020	76
2019	243
2018	118
2017	148
2016	141
2015	81
Prior	32
GM Financial receivables, net of fees	$ 11,760	$ 11,671
Percent	100.00%
Commercial Finance Receivables [Member] | GM Financial [Member] | Group I - Performing accounts with strong to acceptable financial metrics [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving	$ 9,976
2020	76
2019	226
2018	105
2017	113
2016	118
2015	63
Prior	9
GM Financial receivables, net of fees	$ 10,686
Percent	90.90%
Commercial Finance Receivables [Member] | GM Financial [Member] | Group II - Performing accounts experiencing potential weakness in financial metrics [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving	$ 606
2020	0
2019	9
2018	3
2017	21
2016	23
2015	13
Prior	23
GM Financial receivables, net of fees	$ 698
Percent	5.90%
Commercial Finance Receivables [Member] | GM Financial [Member] | Group III - Non-Performing accounts with inadequate paying capacity for current obligations [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving	$ 325
2020	0
2019	8
2018	10
2017	14
2016	0
2015	1
Prior	0
GM Financial receivables, net of fees	$ 358
Percent	3.00%
Commercial Finance Receivables [Member] | GM Financial [Member] | Group IV - Non-Performing accounts with inadequate paying capacity for current obligations and inherent weaknesses [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Revolving	$ 14
2020	0
2019	0
2018	0
2017	0
2016	0
2015	4
Prior	0
GM Financial receivables, net of fees	$ 18
Percent	0.20%
Floorplan Advances [Member] | Commercial Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Percent of revolving balance	98.00%

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Financing Receivable, Originated Five Years before Latest Fiscal Year

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Amount of financing receivable originated four years prior to latest fiscal year.

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