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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments        
Amount of (Loss) Gain Recognized in Income on Derivatives $ 55 $ (5) $ 57 $ (40)
Foreign currency forward contracts | Other income (expense)        
Derivative Instruments        
Amount of (Loss) Gain Recognized in Income on Derivatives 53 (5) 55 (40)
Fuel swaps | Other income (expense)        
Derivative Instruments        
Amount of (Loss) Gain Recognized in Income on Derivatives $ 2 $ 0 $ 2 $ 0