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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related Party Transactions [Line Items]
Financing receivable, net	$ 57,992	$ 52,956
Common stock dividends declared	800	400	$ 375
Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable, net	8,619	11,593
Eliminations/ Reclassifications
Related Party Transactions [Line Items]
Subvention receivable	642	676
Interest subvention earned on finance receivables	679	588	554
Leased vehicle subvention earned	3,042	3,273	3,274
Cash payments to GM Financial	3,900	4,100	$ 3,800
Eliminations/ Reclassifications | Commercial Portfolio Segment
Related Party Transactions [Line Items]
Financing receivable, net	398	478
Commercial loan funding payable	$ 23	$ 74

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