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Commitments and Contingencies - Insurance (Details) - USD ($)
 3 Months Ended 9 Months Ended 32 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]            
Percentage of potential losses covered by insurance on legal liabilities for bodily injury and property damage to third parties 83.00%   83.00%   83.00%  
Policy insurance coverage for bodily injury and property damage to third parties, minimum $ 75,000,000   $ 75,000,000   $ 75,000,000  
Self-insured for bodily injury and property damage to third parties coverage amount, maximum 734,000,000   734,000,000   734,000,000  
Self insured for bodily injury and property damage to third parties, pollution releases above 800,000,000   800,000,000   800,000,000  
Self insured for bodily injury and property damage to third parties, pollution releases , additional liability $ 43,000,000   $ 43,000,000   $ 43,000,000  
Percentage of potential losses covered by insurance on damage to property owned or in control 77.00%   77.00%   77.00%  
Policy insurance coverage for potential losses on damage to property owned or in control, minimum $ 75,000,000   $ 75,000,000   $ 75,000,000  
Policy insurance coverage for potential losses on damage to property owned or in control, maximum 275,000,000   275,000,000   275,000,000  
Eastern Ohio Incident            
Loss Contingencies [Line Items]            
Insurance recoveries 16,000,000 $ 288,000,000 314,000,000 $ 552,000,000 1,100,000,000  
Insurance recoveries receivable $ 49,000,000   $ 49,000,000   $ 49,000,000 $ 18,000,000