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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
Sep. 30, 2024
Dec. 31, 2023
Derivative financial instruments    
Asset Derivatives    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Derivative financial instruments Derivative financial instruments
Liability Derivatives    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Derivative financial instruments Derivative financial instruments
Other assets    
Asset Derivatives    
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets, net of allowances of $42 and $43 at September 30, 2024 and December 31, 2023, respectively Other assets, net of allowances of $42 and $43 at September 30, 2024 and December 31, 2023, respectively
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] $ 112 $ 144
Liability Derivatives    
Liability Derivatives [1] 88 66
Interest rate swaps | Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives 0 1
Liability Derivatives    
Liability Derivatives 0 0
Interest rate swaps | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 46 75
Interest rate swaps | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] 0 0
Foreign currency forward contracts | Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 38 20
Liability Derivatives    
Liability Derivatives [1] 4 9
Foreign currency forward contracts | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 25 44
Foreign currency forward contracts | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] 0 4
Fuel swaps | Designated as Hedging Instrument | Derivative financial instruments    
Asset Derivatives    
Asset Derivatives [1] 2 4
Liability Derivatives    
Liability Derivatives [1] 40 26
Fuel swaps | Designated as Hedging Instrument | Other assets    
Asset Derivatives    
Asset Derivatives [1] 1 0
Fuel swaps | Designated as Hedging Instrument | Other long-term liabilities    
Liability Derivatives    
Liability Derivatives [1] $ 44 $ 27
[1] Subtopic 815-20 “Hedging-General” under ASC 815.