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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 146 | $ 149
Long-term | 319 | 313
Total | 465 | 462
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 58 | 58
Long-term | 152 | 150
Total | 210 | 208
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 51 | 51
Long-term | 93 | 91
Total | 144 | 142
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 7 | 7
Long-term | 59 | 59
Total | 66 | 66
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 37 | 37
Long-term | 114 | 114
Total | 151 | 151
Other |  |
Loss Contingencies [Line Items] |  |
Current | 51 | 54
Long-term | 53 | 49
Total | $ 104 | $ 103

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