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Changes in Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2026
Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Loss by Component | The following table presents the changes in accumulated other comprehensive loss by component for the quarters ended March 31, 2026 and 2025 (in millions):
| Accumulated Other Comprehensive Loss for the Quarter Ended March 31, 2026 |  | Accumulated Other Comprehensive Loss for the Quarter Ended March 31, 2025
| Changes related to cash flow derivative hedges |  | Changes in defined benefit plans |  | Foreign currency translation adjustments |  | Accumulated other comprehensive loss |  | Changes related to cash flow derivative hedges |  | Changes in defined benefit plans |  | Foreign currency translation adjustments |  | Accumulated other comprehensive loss
Accumulated comprehensive loss at beginning of the year | $ | (595) |  |  | $ | 6 |  |  | $ | (15) |  |  | $ | (604) |  |  | $ | (823) |  |  | $ | 10 |  |  | $ | 11 |  |  | $ | (802) |
Other comprehensive income (loss) before reclassifications | 239 |  |  | (2) |  |  | — |  |  | 237 |  |  | 133 |  |  | (4) |  |  | (17) |  |  | 112 |
Amounts reclassified from accumulated other comprehensive loss | (18) |  |  | — |  |  | — |  |  | (18) |  |  | (5) |  |  | — |  |  | — |  |  | (5) |
Net current-period other comprehensive income (loss) | 221 |  |  | (2) |  |  | — |  |  | 219 |  |  | 128 |  |  | (4) |  |  | (17) |  |  | 107 |
Ending balance | $ | (374) |  |  | $ | 4 |  |  | $ | (15) |  |  | $ | (385) |  |  | $ | (695) |  |  | $ | 6 |  |  | $ | (6) |  |  | $ | (695) |
Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss | The following table presents reclassifications out of accumulated other comprehensive loss for the quarters ended March 31, 2026 and 2025 (in millions):
|  | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income |  |
Details About Accumulated Other Comprehensive Loss Components |  | Quarter Ended March 31, 2026 |  |  | Quarter Ended March 31, 2025 |  |  |  |  |  |  | Affected Line Item in Statements of Comprehensive Income (Loss)
Gain (loss) on cash flow derivative hedges: |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 4 |  |  |  | $ | 7 |  |  |  |  |  |  |  | Interest expense, net of interest capitalized
Foreign currency forward contracts |  | (5) |  |  |  | (6) |  |  |  |  |  |  |  | Depreciation and amortization expenses
Fuel swaps |  | 19 |  |  |  | 4 |  |  |  |  |  |  |  | Fuel
|  | $ | 18 |  |  |  | $ | 5 |  |  |  |  |  |  |  |

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