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Restructuring and Other Initiatives - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring payments |  |  | $ 1,303 | $ 1,597 | $ 275
Additions, interest accretion and other |  |  | 1,790 | 1,831 | 522
GMNA |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring costs |  |  |  | 569 | 511
GMNA | Dealer Restructuring and Employee Separation Payments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring costs |  |  | 964 |  |
Restructuring payments |  |  | 530 | 674 | $ 120
GMNA | Dealer Restructuring and Employee Separation Payments | Forecast |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring payments |  | $ 719 |  |  |
GMNA | Voluntary Separation Program |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring costs |  |  |  | 1,000 |
Restructuring payments |  |  | 58 | 820 |
Non-cash pension curtailment and settlement charges |  |  |  | 130 |
Employee separation charges |  |  |  | 905 |
GMNA | Employee Severance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring payments |  |  | 163 |  |
Non-cash pension curtailment and settlement charges |  |  | 200 |  |
Cruise |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring costs |  |  | 522 | 529 |
Restructuring payments |  |  | 287 |  |
Non-cash pension curtailment and settlement charges |  |  |  | $ 250 |
Additions, interest accretion and other | $ 631 |  | 173 |  |
Cruise | Forecast |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring payments |  | $ 389 |  |  |
GMI |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Pre-tax restructuring costs |  |  | 170 |  |
Supplier related charges |  |  | 88 |  |
Non-cash pension curtailment and settlement charges |  |  | 79 |  |
GMI | Dealer Restructuring and Employee Separation Payments |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Restructuring payments |  |  | $ 48 |  |

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