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Fair Value of Financial Instruments (Details) - Fair value measurements, nonrecurring - Fair value inputs, Level 2 - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Carrying Amount    
Fair Value Disclosure    
Liabilities—Long-term debt (excluding finance leases) $ 1,686 $ 1,924
Fair Value    
Fair Value Disclosure    
Liabilities—Long-term debt (excluding finance leases) $ 1,336 $ 1,462