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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	$ 59,738		$ 59,738		$ 57,992
Common stock dividends declared and paid	600		1,800	$ 800
Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	4,177		4,177		8,619
Intersegment Eliminations
Related Party Transaction [Line Items]
Subvention receivable	305		305		642
Interest subvention earned on finance receivables	211	$ 178	610	496
Leased vehicle subvention earned	670	749	2,095	2,319
Cash payments	828	$ 943	2,900	$ 3,000
Intersegment Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	184		184		398
Commercial loan funding payable	$ 17		$ 17		$ 23

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