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GM Financial Receivables and Transactions - Summary of Finance Receivables (Details) - GM Financial - USD ($) $ in Millions	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Finance Receivables [Line Items]
GM Financial receivables, net of fees	$ 68,733		$ 64,702
Less: allowance for loan losses	(2,027)	$ (1,928)	(1,886)	$ (1,850)	$ (1,835)	$ (1,978)
GM Financial receivables, net	66,706		62,816
Retail Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	61,208		58,093	$ 56,357
Less: allowance for loan losses	(1,987)		(1,839)
GM Financial receivables, net	59,220		56,254
Commercial Finance Receivables
Finance Receivables [Line Items]
GM Financial receivables, net of fees	7,526		6,609
Less: allowance for loan losses	(40)		(47)
GM Financial receivables, net	7,486		6,562
Dealer cash management balance	1,300		1,000
Level 2
Finance Receivables [Line Items]
Fair value of GM Financial receivables	7,486		6,562
Level 3
Finance Receivables [Line Items]
Fair value of GM Financial receivables	$ 58,528		$ 57,613

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