GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss of finance receivables, percentage	2.60%	2.70%
GM Financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 2,344	$ 2,096	$ 1,886
Provision for loan losses	1,029	826	654
Charge-offs	(1,756)	(1,423)	(1,138)
Recoveries	903	768	686
Effect of foreign currency and other	(61)	76	9
Allowance for loan losses at end of period	$ 2,458	$ 2,344	$ 2,096

Percentage of allowance for credit loss to nonaccrual financing receivable.

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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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Amount of increase in allowance for credit loss on financing receivable from recovery.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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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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