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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 |  |  |

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