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Restructuring and Other Initiatives - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | --- | ---
Jun. 30, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring payments |  | $ 353,000,000 | $ 325,000,000 |  |  |
Additions, interest accretion and other |  | 131,000,000 | $ 114,000,000 |  |  |
GMNA | Dealer Restructuring and Employee Separation Payments |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pre-tax restructuring costs |  | 0 |  |  |  |
Restructuring payments |  | 160,000,000 |  |  |  |
Cost incurred since 2022 |  | 2,000,000,000 |  |  |  | $ 2,000,000,000
Cash outflows to date |  | 1,500,000,000 |  |  |  | 1,500,000,000
Expected cost to be paid in 2025 |  | 559,000,000 |  |  |  | 559,000,000
Cruise |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Pre-tax restructuring costs |  |  |  | $ 522,000,000 | $ 529,000,000 |
Restructuring payments |  |  |  |  |  | 380,000,000
Other restructuring charges |  |  |  |  | $ 250,000,000 |
Expected cost to be paid in 2025 |  | $ 325,000,000 |  |  |  | $ 325,000,000
Additions, interest accretion and other | $ 631,000,000 |  |  | $ 173,000,000 |  |

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