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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 133 | $ 144
Long-term | 302 | 292
Total | 435 | 436
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 47 | 50
Long-term | 147 | 144
Total | 194 | 194
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 40 | 40
Long-term | 87 | 86
Total | 127 | 126
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 7 | 10
Long-term | 60 | 58
Total | 67 | 68
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 40 | 53
Long-term | 117 | 108
Total | 157 | 161
Other |  |
Loss Contingencies [Line Items] |  |
Current | 46 | 41
Long-term | 38 | 40
Total | $ 84 | $ 81

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