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Restructuring and Other Initiatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Restructuring Cost and Reserve [Line Items]
Additions, interest accretion, and other	$ 1,070	$ 131
Restructuring payments	2,429	$ 353
GMNA
Restructuring Cost and Reserve [Line Items]
Additions, interest accretion, and other			$ 7,900
GMNA \| Impairment and Other Charges
Restructuring Cost and Reserve [Line Items]
Additions, interest accretion, and other	1,100		3,200
GMNA \| Contract Termination
Restructuring Cost and Reserve [Line Items]
Additions, interest accretion, and other			4,700
GMNA \| Ongoing Commercial Negotiations
Restructuring Cost and Reserve [Line Items]
Additions, interest accretion, and other	1,000
GMNA \| EV Related Write Down
Restructuring Cost and Reserve [Line Items]
Restructuring payments	2,200		400
Cruise
Restructuring Cost and Reserve [Line Items]
Restructuring payments	$ 0		347
Restructuring reserve, accrual adjustment			$ 76