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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 89 | $ 90
Long-term | 229 | 224
Total | 318 | 314
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 49 | 49
Long-term | 151 | 147
Total | 200 | 196
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 38 | 38
Long-term | 99 | 93
Total | 137 | 131
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 11 | 11
Long-term | 52 | 54
Total | 63 | 65
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 23 | 23
Long-term | 54 | 53
Total | 77 | 76
Other |  |
Loss Contingencies [Line Items] |  |
Current | 17 | 18
Long-term | 24 | 24
Total | $ 41 | $ 42

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