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Restructuring and Other Initiatives - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring payments |  |  | $ 541,000,000 | $ 247,000,000 | $ 894,000,000 | $ 572,000,000 |  |
Additions, interest accretion and other |  |  | 370,000,000 | $ 299,000,000 | 502,000,000 | $ 412,000,000 |  |
GMNA | Dealer Restructuring and Employee Separation Payments |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax restructuring costs |  |  |  |  | 0 |  |  |
Restructuring payments |  |  |  |  | 465,000,000 |  |  |
Cost incurred since 2022 |  |  | 2,000,000,000 |  | 2,000,000,000 |  |  | $ 2,000,000,000
Cash outflows to date |  |  | 1,800,000,000 |  | 1,800,000,000 |  |  | 1,800,000,000
Expected cost to be paid in 2025 |  |  | 254,000,000 |  | 254,000,000 |  |  | 254,000,000
Cruise |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax restructuring costs | $ 522,000,000 |  |  |  |  |  | $ 529,000,000 |
Restructuring payments |  |  |  |  |  |  |  | 496,000,000
Expected cost to be paid in 2025 |  |  | $ 219,000,000 |  | $ 219,000,000 |  |  | $ 219,000,000
Other restructuring charges |  |  |  |  |  |  | $ 250,000,000 |
Additions, interest accretion and other | $ 173,000,000 | $ 631,000,000 |  |  |  |  |  |

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