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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	$ 66,706		$ 66,706		$ 62,816
Common stock dividends declared and paid	750	$ 600	750	$ 1,200
Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	7,486		7,486		6,562
Intersegment Eliminations
Related Party Transaction [Line Items]
Subvention receivable	475		475		282
Interest subvention earned on finance receivables	235	211	455	399
Leased vehicle subvention earned	500	704	1,047	1,425
Cash payments	561	$ 1,000	1,000	$ 2,000
Intersegment Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	133		133		163
Commercial loan funding payable	$ 41		$ 41		$ 26

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