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Casualty, Environmental and Other Reserves - Narrative (Details)
Jun. 01, 2021
USD ($)
May 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
claim
site
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]            
Reserves     $ 368,000,000 $ 314,000,000 $ 305,000,000 $ 324,000,000
Casualty Reserves            
Loss Contingencies [Line Items]            
Reserves     $ 180,000,000 196,000,000 187,000,000 199,000,000
Self-insured retention amount per injury $ 100,000,000 $ 75,000,000        
Individual claims expected to exceed self-insured retention amount | claim     0      
Personal Injury            
Loss Contingencies [Line Items]            
Reserves     $ 118,000,000 131,000,000    
Environmental            
Loss Contingencies [Line Items]            
Reserves     $ 108,000,000 76,000,000 74,000,000 80,000,000
Environmental impaired sites | site     220      
Other            
Loss Contingencies [Line Items]            
Reserves     $ 80,000,000 $ 42,000,000 $ 44,000,000 $ 45,000,000