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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	$ 58,272		$ 57,992
Common stock dividends declared and paid	600	$ 400
Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	6,659		8,619
Intersegment Eliminations
Related Party Transaction [Line Items]
Subvention receivable	668		642
Interest subvention earned on finance receivables	188	156
Leased vehicle subvention earned	721	805
Cash payments	1,000	$ 1,100
Intersegment Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	313		398
Commercial loan funding payable	$ 61		$ 23

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