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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Financing receivable, net	$ 54,753		$ 54,753		$ 52,956
Common stock dividends declared and paid			800
Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	7,995		7,995		11,593
Intersegment Eliminations [Member]
Related Party Transaction [Line Items]
Subvention receivable	566		566		676
Interest subvention earned on finance receivables	178	$ 153	496	$ 448
Leased vehicle subvention earned	749	814	2,319	2,467
Cash payments	943	$ 1,000	3,000	$ 3,100
Intersegment Eliminations [Member] | Commercial Finance Receivables [Member]
Related Party Transaction [Line Items]
Financing receivable, net	399		399		478
Commercial loan funding payable	$ 75		$ 75		$ 74

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