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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Loss Contingencies [Line Items]    
Current $ 147 $ 144 [1]
Long-term 309 296 [1]
Total 456 440
Total Casualty    
Loss Contingencies [Line Items]    
Current 62 52
Long-term 149 143
Total 211 195
Personal Injury    
Loss Contingencies [Line Items]    
Current 51 45
Long-term 91 83
Total 142 128
Occupational    
Loss Contingencies [Line Items]    
Current 11 7
Long-term 58 60
Total 69 67
Environmental    
Loss Contingencies [Line Items]    
Current 36 41
Long-term 111 113
Total 147 154
Other    
Loss Contingencies [Line Items]    
Current 49 51
Long-term 49 40
Total $ 98 $ 91
[1] See Note 11, Revision of Prior Period Financial Statements.