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GM Financial Receivables and Transactions - Credit Risk Profile by FICO Score (Details) - GM Financial - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables, net of fees	$ 61,801	$ 59,970
Retail Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2021	16,323	26,183
2020	21,628	12,050
2019	9,370	7,463
2018	5,488	3,693
2017	2,517	1,390
Prior	1,031	509
GM Financial receivables, net of fees	$ 56,357	$ 51,288	$ 46,472
Percent	100.00%	100.00%
Retail Finance Receivables | Prime – FICO score 680 and greater
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 11,303	$ 18,685
2020	15,390	7,033
2019	5,414	4,491
2018	3,263	1,917
2017	1,261	555
Prior	328	119
GM Financial receivables, net of fees	$ 36,959	$ 32,800
Percent	65.60%	64.00%
Retail Finance Receivables | Near-prime – FICO score 620 to 679
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 2,434	$ 3,695
2020	3,045	2,097
2019	1,639	1,232
2018	907	603
2017	420	225
Prior	168	83
GM Financial receivables, net of fees	$ 8,613	$ 7,935
Percent	15.30%	15.40%
Retail Finance Receivables | Sub-prime – FICO score less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 2,586	$ 3,803
2020	3,193	2,920
2019	2,317	1,740
2018	1,318	1,173
2017	836	610
Prior	535	307
GM Financial receivables, net of fees	$ 10,785	$ 10,553
Percent	19.10%	20.60%

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