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Changes in Accumulated Other Comprehensive Loss
9 Months Ended
Sep. 30, 2024
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Changes in Accumulated Other Comprehensive Loss
Note 10. Changes in Accumulated Other Comprehensive Loss
The following table presents the changes in accumulated other comprehensive loss by component for the nine months ended September 30, 2024 and 2023 (in millions):
Accumulated Other Comprehensive Loss for the Nine Months Ended September 30, 2024Accumulated Other Comprehensive Loss for the Nine Months Ended September 30, 2023
 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$(666)$(2)$(6)$(674)$(638)$(8)$$(643)
Other comprehensive income (loss) before reclassifications(46)— (43)12 
Amounts reclassified from accumulated other comprehensive loss(36)— — (36)(13)— — (13)
Net current-period other comprehensive income (loss)(82)— (79)(7)(1)
Ending balance$(748)$$(6)$(753)$(645)$(4)$$(644)

The following table presents reclassifications out of accumulated other comprehensive loss for the quarters and nine months ended September 30, 2024 and 2023 (in millions):
 Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income 
Details About Accumulated Other Comprehensive Loss ComponentsQuarter Ended September 30, 2024Quarter Ended September 30, 2023Nine Months Ended September 30, 2024Nine Months Ended September 30, 2023Affected Line Item in Statements of
Comprehensive Income (Loss)
Gain (loss) on cash flow derivative hedges:  
Interest rate swaps$11 $15 $36 $35 Interest expense, net of interest capitalized
Foreign currency forward contracts(6)(4)(17)(13)Depreciation and amortization expenses
Foreign currency forward contracts— — — (10)Other (expense) income
Fuel swaps16 17 Fuel
 $$27 $36 $13