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Restructuring and Other Initiatives - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Jun. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2025
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring payments |  |  | $ 379,000,000 | $ 363,000,000 | $ 1,274,000,000 | $ 935,000,000 |  |
Restructuring charges |  |  | 366,000,000 | $ 369,000,000 | 868,000,000 | $ 781,000,000 |  |
GMNA |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  | 1,600,000,000 |  |  |  |  |
GMNA | Dealer Restructuring and Employee Separation Payments |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax restructuring costs |  |  |  |  | 0 |  |  |
Restructuring payments |  |  |  |  | 708,000,000 |  |  |
Cost incurred since 2022 |  |  | 2,000,000,000 |  | 2,000,000,000 |  |  | $ 2,000,000,000
Cash outflows to date |  |  | 2,000,000,000.0 |  | 2,000,000,000.0 |  |  | 2,000,000,000.0
GMNA | Contract Termination |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  | 404,000,000 |  |  |  |  |
GMNA | Contract Cancellation Fees And Commercial Settlements |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  | 356,000,000 |  |  |  |  |
GMNA | Electric Vehicle Capacity Adjustment |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  | 1,200,000,000 |  |  |  |  |
Cruise |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Pre-tax restructuring costs | $ 522,000,000 |  |  |  |  |  | $ 529,000,000 |
Restructuring payments |  |  |  |  |  |  |  | 577,000,000
Restructuring charges | $ 173,000,000 | $ 631,000,000 |  |  |  |  |  |
Contract cancellation fees and commercial settlements |  |  |  |  |  |  | $ 250,000,000 |
Expected cost to be paid in 2025 |  |  | $ 137,000,000 |  | $ 137,000,000 |  |  | $ 137,000,000

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