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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 117 | $ 90
Long-term | 252 | 224
Total | 369 | 314
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 51 | 49
Long-term | 139 | 147
Total | 190 | 196
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 44 | 38
Long-term | 82 | 93
Total | 126 | 131
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 7 | 11
Long-term | 57 | 54
Total | 64 | 65
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 36 | 23
Long-term | 72 | 53
Total | 108 | 76
Other |  |
Loss Contingencies [Line Items] |  |
Current | 30 | 18
Long-term | 41 | 24
Total | $ 71 | $ 42

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