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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 66,776	$ 64,702
Less: allowance for loan losses	(1,928)	(1,886)	$ (1,835)	$ (1,978)
GM Financial receivables, net	64,848	62,816
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	59,503	58,093	$ 53,397
Less: allowance for loan losses	(1,884)	(1,839)
GM Financial receivables, net	57,618	56,254
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	7,274	6,609
Less: allowance for loan losses	(44)	(47)
GM Financial receivables, net	7,230	6,562
Dealer cash management balance	1,200	1,000
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	7,230	6,562
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 57,774	$ 57,613

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