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Changes in Accumulated Other Comprehensive Loss (Tables)
9 Months Ended
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, 2025Accumulated Other Comprehensive Loss for the Nine Months Ended September 30, 2024
 Changes related to cash flow derivative hedgesChanges in defined benefit plansForeign currency translation adjustmentsAccumulated other comprehensive lossChanges related to cash flow derivative hedgesChanges in defined benefit plansForeign currency translation adjustmentsAccumulated other comprehensive loss
Accumulated comprehensive loss at beginning of the year$(823)$10 $11 $(802)$(666)$(2)$(6)$(674)
Other comprehensive income (loss) before reclassifications303 (2)(30)271 (46)— (43)
Amounts reclassified from accumulated other comprehensive loss— (36)— — (36)
Net current-period other comprehensive income (loss)304 (2)(28)274 (82)— (79)
Ending balance$(519)$$(17)$(528)$(748)$$(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 ComponentsQuarter Ended September 30, 2025Quarter Ended September 30, 2024Nine Months Ended September 30, 2025Nine Months Ended September 30, 2024Affected Line Item in Statements of
Comprehensive Income (Loss)
Gain (loss) on cash flow derivative hedges:  
Interest rate swaps$$11 $18 $36 Interest expense, net of interest capitalized
Foreign currency forward contracts(6)(6)(17)(17)Depreciation and amortization expenses
Fuel swaps(2)(2)17 Fuel
 $(2)$$(1)$36