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Fair Value Measurements and Derivative Instruments - Schedule of Fair Value and Line Item Caption of Derivative Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Asset Derivatives    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Liability Derivatives    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities
Derivative financial instruments    
Liability Derivatives    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative financial instruments Derivative financial instruments
Other long-term liabilities    
Liability Derivatives    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Other long-term liabilities Other long-term liabilities
Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives [1] $ 113 $ 71
Liability Derivatives    
Liability Derivatives [1] 59 139
Interest rate swaps | Designated as Hedging Instrument    
Asset Derivatives    
Asset Derivatives [1] 44 58
Liability Derivatives    
Liability Derivatives [1] 0 0
Foreign currency forward contracts | Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 21 0
Liability Derivatives    
Liability Derivatives [1] 18 71
Foreign currency forward contracts | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 27 0
Foreign currency forward contracts | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] 4 22
Fuel swaps | Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 15 10
Liability Derivatives    
Liability Derivatives [1] 17 19
Fuel swaps | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 6 3
Fuel swaps | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] $ 20 $ 27
[1] Subtopic 815-20 “Hedging-General” under ASC 815.