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GM Financial Receivables and Transactions - Credit Risk Profile by FICO Score (Details) - GM Financial [Member] - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables, net of fees	$ 53,961	$ 53,900
Retail Finance Receivables [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	14,007
2019	14,720
2018	9,612
2017	5,042
2016	2,113
2015	787
Prior	191
GM Financial receivables, net of fees	$ 46,472	$ 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	$ 10,305
2019	9,009
2018	6,056
2017	2,774
2016	940
2015	253
Prior	9
GM Financial receivables, net of fees	$ 29,346	$ 25,400
Percent	63.20%	60.10%
Retail Finance Receivables [Member] | Near-prime - FICO score 620 to 679 [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,785
2019	2,533
2018	1,574
2017	828
2016	340
2015	138
Prior	25
GM Financial receivables, net of fees	$ 7,223	$ 6,862
Percent	15.50%	16.30%
Retail Finance Receivables [Member] | Sub-prime - FICO score less than 620 [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
2020	$ 1,917
2019	3,178
2018	1,982
2017	1,440
2016	833
2015	396
Prior	157
GM Financial receivables, net of fees	$ 9,903	$ 9,967
Percent	21.30%	23.60%

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

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