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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	$ 70,600		$ 70,600		$ 62,816
Common stock dividends declared and paid	275	$ 600	1,000	$ 1,800
Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	9,183		9,183		6,562
Intersegment Eliminations
Related Party Transaction [Line Items]
Subvention receivable	480		480		282
Interest subvention earned on finance receivables	260	211	715	610
Leased vehicle subvention earned	456	670	1,503	2,095
Cash payments	732	$ 828	1,700	$ 2,900
Intersegment Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	177		177		163
Commercial loan funding payable	$ 45		$ 45		$ 26

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