GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss of finance receivables, percentage	3.00%		3.00%		2.60%
GM Financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 2,720	$ 2,311	$ 2,458	$ 2,344
Provision for loan losses	244	298	926	676
Charge-offs	(494)	(439)	(1,463)	(1,255)
Recoveries	257	217	778	653
Effect of foreign currency	8	(10)	37	(40)
Allowance for loan losses at end of period	$ 2,736	$ 2,377	$ 2,736	$ 2,377

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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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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