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Fair Value Measurements and Derivative Instruments - Schedule of Effect of Derivative Instruments Not Designated as Cash Flow Hedging Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Effect of derivative instruments involved in hedging on the consolidated financial statements        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives $ (6) $ (86) $ 303 $ (46)
Interest rate swaps        
Effect of derivative instruments involved in hedging on the consolidated financial statements        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives 1 (20) (7) 8
Foreign currency forward contracts        
Effect of derivative instruments involved in hedging on the consolidated financial statements        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives (20) 67 334 (36)
Fuel swaps        
Effect of derivative instruments involved in hedging on the consolidated financial statements        
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives $ 13 $ (133) $ (24) $ (18)