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Restructuring and Other Initiatives - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended | 15 Months Ended | 24 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Dec. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2025 | Sep. 30, 2024
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring payments |  |  | $ 363 | $ 661 | $ 935 | $ 1,266 |  |  |  |
Additions, interest accretion and other |  |  | 369 | $ 161 | 781 | $ 1,396 |  |  |  |
GMNA | Dealer Restructuring and Employee Separation Payments |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax restructuring costs |  |  | 150 |  | 321 |  |  |  |  | $ 1,400
Restructuring payments |  |  |  |  | 376 |  |  |  |  | $ 1,200
GMNA | Dealer Restructuring and Employee Separation Payments | Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring payments |  |  |  |  |  |  |  |  | $ 231 |
GMNA | Employee Separation Programs |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax restructuring costs |  |  | 190 |  |  |  |  |  |  |
Restructuring payments |  |  | $ 74 |  |  |  |  |  |  |
GMNA | Employee Separation Programs | Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring payments |  |  |  |  |  |  |  |  | 116 |
GMI |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax restructuring costs |  |  |  |  | 166 |  |  |  |  |
Restructuring payments |  |  |  |  | 35 |  |  |  |  |
Additions, interest accretion and other |  |  |  |  | 91 |  |  |  |  |
Non-cash accelerated depreciation and amortization |  |  |  |  | $ 73 |  |  |  |  |
GMI | Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring payments |  | $ 56 |  |  |  |  |  |  |  |
Cruise |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Pre-tax restructuring costs |  |  |  |  |  |  |  | $ 529 |  |
Restructuring payments |  |  |  |  |  |  | $ 218 |  |  |
Additions, interest accretion and other | $ 631 |  |  |  |  |  |  |  |  |
Other restructuring charges |  |  |  |  |  |  |  | $ 250 |  |
Cruise | Forecast |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |
Restructuring payments |  |  |  |  |  |  |  |  | $ 112 |

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