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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Related Party Transaction [Line Items]
Financing receivable, net	$ 64,848		$ 62,816
Common stock dividends declared and paid		$ 600
Commercial Finance Receivables
Related Party Transaction [Line Items]
Financing receivable, net	7,230		6,562
Intersegment Eliminations
Related Party Transaction [Line Items]
Subvention receivable	357		282
Interest subvention earned on finance receivables	221	188
Leased vehicle subvention earned	547	721
Cash payments	439	$ 1,000
Intersegment Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
Financing receivable, net	122		163
Commercial loan funding payable	$ 41		$ 26

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