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GM Financial Receivables and Transactions - Credit Risk Profile by FICO Score (Details) - GM Financial - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]
GM Financial receivables, net of fees	$ 64,702	$ 59,970
Retail Finance Receivables
Financing Receivable, Credit Quality Indicator [Line Items]
2021	27,638	26,183
2020	17,324	12,050
2019	7,084	7,463
2018	3,918	3,693
2017	1,607	1,390
Prior	522	509
GM Financial receivables, net of fees	$ 58,093	$ 51,288
Percent	100.00%	100.00%
Retail Finance Receivables | Prime – FICO score 680 and greater
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 19,729	$ 18,685
2020	12,408	7,033
2019	4,078	4,491
2018	2,298	1,917
2017	763	555
Prior	143	119
GM Financial receivables, net of fees	$ 39,419	$ 32,800
Percent	67.90%	64.00%
Retail Finance Receivables | Near-prime – FICO score 620 to 679
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 3,856	$ 3,695
2020	2,388	2,097
2019	1,229	1,232
2018	648	603
2017	274	225
Prior	84	83
GM Financial receivables, net of fees	$ 8,479	$ 7,935
Percent	14.60%	15.40%
Retail Finance Receivables | Sub-prime – FICO score less than 620
Financing Receivable, Credit Quality Indicator [Line Items]
2021	$ 4,053	$ 3,803
2020	2,528	2,920
2019	1,777	1,740
2018	972	1,173
2017	570	610
Prior	295	307
GM Financial receivables, net of fees	$ 10,195	$ 10,553
Percent	17.50%	20.60%

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