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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
Derivative Instruments        
Amount of (Loss) Gain Recognized in Income on Derivatives $ (10) $ 33 $ 46 $ (8)
Foreign currency forward contracts | Other income (expense)        
Derivative Instruments        
Amount of (Loss) Gain Recognized in Income on Derivatives (10) 33 44 (8)
Fuel swaps | Other income (expense)        
Derivative Instruments        
Amount of (Loss) Gain Recognized in Income on Derivatives $ 0 $ 0 $ 2 $ 0