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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Loss Contingencies [Line Items]    
Current $ 159 $ 149
Long-term 311 313
Total 470 462
Total Casualty    
Loss Contingencies [Line Items]    
Current 61 58
Long-term 147 150
Total 208 208
Personal Injury    
Loss Contingencies [Line Items]    
Current 54 51
Long-term 94 91
Total 148 142
Occupational    
Loss Contingencies [Line Items]    
Current 7 7
Long-term 53 59
Total 60 66
Environmental    
Loss Contingencies [Line Items]    
Current 39 37
Long-term 110 114
Total 149 151
Other    
Loss Contingencies [Line Items]    
Current 59 54
Long-term 54 49
Total $ 113 $ 103