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GM Financial Receivables and Transactions - Credit Risk Profile by FICO Score (Details) - GM Financial [Member] - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables, net of fees	$ 54,234	$ 53,900
Retail Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	6,098
2019	16,124
2018	10,715
2017	5,746
2016	2,502
2015	1,007
Prior	282
GM Financial receivables, net of fees	$ 42,474	$ 42,229
Percent	100.00%	100.00%
Retail Finance Receivables [Member] | Prime - FICO score 680 and greater [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 4,027
2019	9,976
2018	6,806
2017	3,199
2016	1,143
2015	343
Prior	15
GM Financial receivables, net of fees	$ 25,509	$ 25,400
Percent	60.00%	60.10%
Retail Finance Receivables [Member] | Near-prime - FICO score 620 to 679 [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 902
2019	2,746
2018	1,744
2017	942
2016	402
2015	178
Prior	38
GM Financial receivables, net of fees	$ 6,952	$ 6,862
Percent	16.40%	16.30%
Retail Finance Receivables [Member] | Sub-prime - FICO score less than 620 [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,169
2019	3,402
2018	2,165
2017	1,605
2016	957
2015	486
Prior	229
GM Financial receivables, net of fees	$ 10,013	$ 9,967
Percent	23.60%	23.60%

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

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