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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 118 | $ 118
Long-term | 267 | 250
Total | 385 | 368
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 44 | 44
Long-term | 137 | 136
Total | 181 | 180
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 37 | 37
Long-term | 84 | 81
Total | 121 | 118
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 7 | 7
Long-term | 53 | 55
Total | 60 | 62
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 38 | 37
Long-term | 90 | 71
Total | 128 | 108
Other |  |
Loss Contingencies [Line Items] |  |
Current | 36 | 37
Long-term | 40 | 43
Total | $ 76 | $ 80

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