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Restructuring and Other Initiatives - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Cost and Reserve [Line Items]
Restructuring payments			$ 1,303	$ 1,597	$ 275
Additions, interest accretion and other			1,790	1,831	522
GMNA
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs				569	511
GMNA \| Dealer Restructuring and Employee Separation Payments
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs			964
Restructuring payments			530	674	$ 120
GMNA \| Dealer Restructuring and Employee Separation Payments \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments		$ 719
GMNA \| Voluntary Separation Program
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs				1,000
Restructuring payments			58	820
Non-cash pension curtailment and settlement charges				130
Employee separation charges				905
GMNA \| Employee Severance
Restructuring Cost and Reserve [Line Items]
Restructuring payments			163
Non-cash pension curtailment and settlement charges			200
Cruise
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs			522	529
Restructuring payments			287
Non-cash pension curtailment and settlement charges				$ 250
Additions, interest accretion and other	$ 631		173
Cruise \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments		$ 389
GMI
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs			170
Supplier related charges			88
Non-cash pension curtailment and settlement charges			79
GMI \| Dealer Restructuring and Employee Separation Payments
Restructuring Cost and Reserve [Line Items]
Restructuring payments			$ 48