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Changes in Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2025
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 nine months ended September 30, 2025 and 2024 (in millions):
| Accumulated Other Comprehensive Loss for the Nine Months Ended September 30, 2025 |  | Accumulated Other Comprehensive Loss for the Nine Months Ended September 30, 2024
| 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 | $ | (823) |  |  | $ | 10 |  |  | $ | 11 |  |  | $ | (802) |  |  | $ | (666) |  |  | $ | (2) |  |  | $ | (6) |  |  | $ | (674) |
Other comprehensive income (loss) before reclassifications | 303 |  |  | (2) |  |  | (30) |  |  | 271 |  |  | (46) |  |  | 3 |  |  | — |  |  | (43) |
Amounts reclassified from accumulated other comprehensive loss | 1 |  |  | — |  |  | 2 |  |  | 3 |  |  | (36) |  |  | — |  |  | — |  |  | (36) |
Net current-period other comprehensive income (loss) | 304 |  |  | (2) |  |  | (28) |  |  | 274 |  |  | (82) |  |  | 3 |  |  | — |  |  | (79) |
Ending balance | $ | (519) |  |  | $ | 8 |  |  | $ | (17) |  |  | $ | (528) |  |  | $ | (748) |  |  | $ | 1 |  |  | $ | (6) |  |  | $ | (753) |
Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss | The following table presents reclassifications out of accumulated other comprehensive loss for the quarters and nine months ended September 30, 2025 and 2024 (in millions):
|  | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income |
Details About Accumulated Other Comprehensive Loss Components |  | Quarter Ended September 30, 2025 |  |  | Quarter Ended September 30, 2024 |  | Nine Months Ended September 30, 2025 |  | Nine Months Ended September 30, 2024 |  |  |  | Affected Line Item in Statements of Comprehensive Income (Loss)
Gain (loss) on cash flow derivative hedges: |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 6 |  |  |  | $ | 11 |  |  | $ | 18 |  |  | $ | 36 |  |  |  |  | Interest expense, net of interest capitalized
Foreign currency forward contracts |  | (6) |  |  |  | (6) |  |  | (17) |  |  | (17) |  |  |  |  | Depreciation and amortization expenses
Fuel swaps |  | (2) |  |  |  | 3 |  |  | (2) |  |  | 17 |  |  |  |  | Fuel
|  | $ | (2) |  |  |  | $ | 8 |  |  | $ | (1) |  |  | $ | 36 |  |  |  |  |

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