GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for credit loss of finance receivables, percentage	2.60%		2.60%		2.70%
GM Financial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for loan losses at beginning of period	$ 2,311	$ 2,202	$ 2,344	$ 2,096
Provision for loan losses	298	235	676	533
Charge-offs	(439)	(366)	(1,255)	(1,012)
Recoveries	217	196	653	574
Effect of foreign currency and other	(10)	(8)	(40)	67
Allowance for loan losses at end of period	$ 2,377	$ 2,258	$ 2,377	$ 2,258