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Changes in Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 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 quarters ended March 31, 2025 and 2024 (in millions):
| Accumulated Other Comprehensive Loss for the Three Months Ended March 31, 2025 |  | Accumulated Other Comprehensive Loss for the Three Months Ended March 31, 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 | 133 |  |  | (4) |  |  | (17) |  |  | 112 |  |  | 56 |  |  | 9 |  |  | 4 |  |  | 69 |
Amounts reclassified from accumulated other comprehensive loss | (5) |  |  | — |  |  | — |  |  | (5) |  |  | (12) |  |  | — |  |  | — |  |  | (12) |
Net current-period other comprehensive income (loss) | 128 |  |  | (4) |  |  | (17) |  |  | 107 |  |  | 44 |  |  | 9 |  |  | 4 |  |  | 57 |
Ending balance | $ | (695) |  |  | $ | 6 |  |  | $ | (6) |  |  | $ | (695) |  |  | $ | (622) |  |  | $ | 7 |  |  | $ | (2) |  |  | $ | (617) |
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, 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 March 31, 2025 |  |  | Quarter Ended March 31, 2024 |  |  |  | Affected Line Item in Statements of Comprehensive Income (Loss)
Gain (loss) on cash flow derivative hedges: |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | 7 |  |  |  | $ | 14 |  |  |  |  | Interest expense, net of interest capitalized
Foreign currency forward contracts |  | (6) |  |  |  | (6) |  |  |  |  | Depreciation and amortization expenses
Fuel swaps |  | 4 |  |  |  | 4 |  |  |  |  | Fuel
|  | $ | 5 |  |  |  | $ | 12 |  |  |  |  |

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