Restructuring and Other Initiatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended	18 Months Ended	21 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2025	Jun. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring payments	$ 247	$ 554	$ 572	$ 605
Additions, interest accretion and other	299	$ 255	412	$ 1,235
GMNA
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs	75		171					$ 1,300
GMNA | Dealer Restructuring and Employee Separation Payments
Restructuring Cost and Reserve [Line Items]
Restructuring payments			276					$ 1,100
GMNA | Dealer Restructuring and Employee Separation Payments | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments							$ 181
GMI
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs	122
Restructuring payments			$ 9
Employee separation charges	56
Non-cash pension curtailment and settlement charges	33
Accelerated depreciation and amortization	32
GMI | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments							81
Cruise
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs						$ 529
Restructuring payments					$ 131
Non-cash pension curtailment and settlement charges						$ 250
Additions, interest accretion and other	$ 631
Cruise | Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments							$ 198