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Casualty, Environmental and Other Reserves - Balance Sheet Presentation (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Contingencies [Line Items] |  |  |  |
Current | $ 118 | $ 90 |  |
Long-term | 250 | 224 |  |
Total | 368 | 314 | $ 305 | $ 324
Casualty |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 44 | 49 |  |
Long-term | 136 | 147 |  |
Total | 180 | 196 | 187 | 199
Personal Injury |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 37 | 38 |  |
Long-term | 81 | 93 |  |
Total | 118 | 131 |  |
Occupational |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 7 | 11 |  |
Long-term | 55 | 54 |  |
Total | 62 | 65 |  |
Environmental |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 37 | 23 |  |
Long-term | 71 | 53 |  |
Total | 108 | 76 | 74 | 80
Other |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 37 | 18 |  |
Long-term | 43 | 24 |  |
Total | $ 80 | $ 42 | $ 44 | $ 45

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