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GM Financial Receivables and Transactions - Intercompany Transactions (Details) - GM Financial - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	$ 59,951		$ 59,951		$ 57,992
Common stock dividends declared and paid	600	$ 400	1,200	$ 800
Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	5,399		5,399		8,619
Intersegment Eliminations
Related Party Transaction [Line Items]
Subvention receivable	590		590		642
Interest subvention earned on finance receivables	211	162	399	318
Leased vehicle subvention earned	704	765	1,425	1,570
Cash payments	1,000	$ 967	2,000	$ 2,000
Intersegment Eliminations | Commercial Finance Receivables
Related Party Transaction [Line Items]
Commercial finance receivables, net due from GM consolidated dealers	261		261		398
Commercial loan funding payable	$ 30		$ 30		$ 23

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