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Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
GM Financial
Consolidated [Abstract]
GM Financial receivables, net of fees – current	$ 24,444	$ 26,209
GM Financial receivables, net of fees – non-current	35,507	31,783
GM Financial short-term debt and current portion of long-term debt	33,294	35,637
GM Financial long-term debt	60,276	56,788
Consolidated VIE | GM Financial
Consolidated [Abstract]
Restricted cash – current	3,191	2,190
Restricted cash – non-current	476	449
GM Financial receivables, net of fees – current	13,726	17,211
GM Financial receivables, net of fees – non-current	14,141	15,107
GM Financial equipment on operating leases, net	17,413	16,322
GM Financial short-term debt and current portion of long-term debt	18,090	20,450
GM Financial long-term debt	20,511	18,974
Variable Interest Entity, Not Primary Beneficiary
Consolidated [Abstract]
Maximum loss exposure amount	2,200	1,200
Variable Interest Entity, Not Primary Beneficiary | Ultium Cells LLC | Capital Addition Purchase Commitments
Consolidated [Abstract]
Committed capital contributions	$ 1,500	$ 776

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