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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - GM Financial - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 911	$ 942	$ 805
Provision for loan losses	726	642	757
Charge-offs	(1,246)	(1,199)	(1,173)
Recoveries	551	536	552
Effect of foreign currency	2	(10)	1
Allowance for loan losses at end of period	944	911	942
Collective allowance	596	586	611
Specific allowance	$ 348	$ 325	$ 331

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- Definition

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

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Amount of recovery of financing receivables doubtful of collection that were previously charged off.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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