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Changes in Accumulated Other Comprehensive Loss - Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest rate swaps $ (248) $ (603) $ (725) $ (1,324)
Depreciation and amortization expenses (435) (410) (1,265) (1,190)
Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income | Gain (loss) on cash flow derivative hedges:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total reclassifications for the period (2) 8 (1) 36
Interest rate swaps | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income | Gain (loss) on cash flow derivative hedges:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest rate swaps 6 11 18 36
Foreign currency forward contracts | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income | Gain (loss) on cash flow derivative hedges:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Depreciation and amortization expenses (6) (6) (17) (17)
Fuel swaps | Amount of Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss into Income | Gain (loss) on cash flow derivative hedges:        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Fuel $ (2) $ 3 $ (2) $ 17