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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 151 | $ 144
Long-term | 287 | 292
Total | 438 | 436
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 50 | 50
Long-term | 143 | 144
Total | 193 | 194
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 40 | 40
Long-term | 87 | 86
Total | 127 | 126
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 10 | 10
Long-term | 56 | 58
Total | 66 | 68
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 53 | 53
Long-term | 109 | 108
Total | 162 | 161
Other |  |
Loss Contingencies [Line Items] |  |
Current | 48 | 41
Long-term | 35 | 40
Total | $ 83 | $ 81

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