Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Consolidated [Abstract]
Total assets	$ 253,517	$ 244,718	$ 241,803
GM Financial
Consolidated [Abstract]
GM Financial receivables, net of fees – current	28,479	26,649
GM Financial receivables, net of fees – non-current	38,227	36,167
GM Financial short-term debt and current portion of long-term debt	31,644	33,257
GM Financial long-term debt	61,960	59,304
Consolidated VIE | GM Financial
Consolidated [Abstract]
Restricted cash – current	2,309	2,291
Restricted cash – non-current	410	449
GM Financial receivables, net of fees – current	15,816	15,344
GM Financial receivables, net of fees – non-current	16,077	16,518
GM Financial equipment on operating leases, net	16,266	16,143
GM Financial short-term debt and current portion of long-term debt	17,626	19,876
GM Financial long-term debt	20,417	19,401
Variable Interest Entity, Not Primary Beneficiary
Consolidated [Abstract]
Total assets	1,200	850
Maximum loss exposure amount	3,200	2,100
Variable Interest Entity, Not Primary Beneficiary | Ultium Cells LLC | Capital Addition Purchase Commitments
Consolidated [Abstract]
Maximum loss exposure amount	750
Committed capital contributions	$ 1,900	$ 1,200