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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - GM Financial - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 1,978	$ 944	$ 911
Provision for loan losses	248	881	726
Charge-offs	(897)	(1,169)	(1,246)
Recoveries	574	542	551
Effect of foreign currency	(17)	(21)	2
Allowance for loan losses at end of period	$ 1,886	1,978	944
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period		$ 801
Allowance for loan losses at end of period			$ 801

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Amount of gain (loss) from converting allowance reserve for credit loss to currency of reporting entity from amount denominated or measured in a different currency, which decreases (increases) the allowance for loan and lease losses.

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