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Restructuring and Other Initiatives - Narrative (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended		15 Months Ended	24 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2025	Sep. 30, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring payments			$ 363	$ 661	$ 935	$ 1,266
Additions, interest accretion and other			369	$ 161	781	$ 1,396
GMNA \| Dealer Restructuring and Employee Separation Payments
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs			150		321					$ 1,400
Restructuring payments					376					$ 1,200
GMNA \| Dealer Restructuring and Employee Separation Payments \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments									$ 231
GMNA \| Employee Separation Programs
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs			190
Restructuring payments			$ 74
GMNA \| Employee Separation Programs \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments									116
GMI
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs					166
Restructuring payments					35
Additions, interest accretion and other					91
Non-cash accelerated depreciation and amortization					$ 73
GMI \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments		$ 56
Cruise
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs								$ 529
Restructuring payments							$ 218
Additions, interest accretion and other	$ 631
Other restructuring charges								$ 250
Cruise \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments									$ 112