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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 1,928	$ 1,835	$ 1,886	$ 1,978
Provision for loan losses	198	59	320	33
Charge-offs	(247)	(204)	(521)	(457)
Recoveries	161	146	339	296
Effect of foreign currency	(14)	14	4	0
Allowance for loan losses at end of period	$ 2,027	$ 1,850	$ 2,027	$ 1,850

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- Definition

Amount of foreign currency translation gain (loss) which decreases (increases) allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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