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Restructuring and Other Initiatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended	12 Months Ended	13 Months Ended	18 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Mar. 31, 2024	Mar. 31, 2024
Restructuring Cost and Reserve [Line Items]
Restructuring payments	$ 325	$ 51
GMNA
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs	96					$ 1,200
GMNA \| Dealer Restructuring and Employee Separation Payments
Restructuring Cost and Reserve [Line Items]
Restructuring payments	162					$ 956
GMNA \| Dealer Restructuring and Employee Separation Payments \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments			$ 220
GMNA \| Voluntary Separation Program
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs				$ 1,000
Restructuring payments					$ 878
Employee separation charges				905
Non-cash pension curtailment and settlement charges				130
Cruise
Restructuring Cost and Reserve [Line Items]
Pre-tax restructuring costs				529
Restructuring payments	$ 70
Employee separation charges				67
Non-cash pension curtailment and settlement charges				250
Business exit costs				$ 212
Cruise \| Forecast
Restructuring Cost and Reserve [Line Items]
Restructuring payments			$ 209