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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
Mar. 31, 2026
Mar. 31, 2025
Effect of derivative instruments involved in hedging on the consolidated financial statements    
Amount of Gain (Loss) Recognized in Accumulated Other Comprehensive Loss on Derivatives $ 239 $ 133
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 5 (5)
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 (124) 117
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 $ 358 $ 21