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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 113 | $ 118
Long-term | 290 | 250
Total | 403 | 368
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 38 | 44
Long-term | 150 | 136
Total | 188 | 180
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 31 | 37
Long-term | 95 | 81
Total | 126 | 118
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 7 | 7
Long-term | 55 | 55
Total | 62 | 62
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 40 | 37
Long-term | 93 | 71
Total | 133 | 108
Other |  |
Loss Contingencies [Line Items] |  |
Current | 35 | 37
Long-term | 47 | 43
Total | $ 82 | $ 80

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