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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Related Party Transactions [Line Items]
Financing receivable, net	$ 62,816	$ 57,992
Common stock dividends declared and paid	3,500	800	$ 400
Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable, net	6,562	8,619
Eliminations/ Reclassifications
Related Party Transactions [Line Items]
Subvention receivable	282	642
Interest subvention earned on finance receivables	820	679	588
Leased vehicle subvention earned	2,702	3,042	3,273
Cash payments to GM Financial	3,300	3,900	$ 4,100
Eliminations/ Reclassifications | Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable, net	163	398
Commercial loan funding payable	$ 26	$ 23

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