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Casualty, Environmental and Other Reserves - Balance Sheet Presentation (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Contingencies [Line Items] |  |  |  |  |
Current | $ 90 | $ 100 | [1] |  |
Long-term | 224 | 205 | [1] |  |
Total | 314 | 305 |  | $ 324 | $ 374
Casualty |  |  |  |  |
Contingencies [Line Items] |  |  |  |  |
Current | 49 | 48 |  |  |
Long-term | 147 | 139 |  |  |
Total | 196 | 187 |  | 199 | 228
Personal Injury |  |  |  |  |
Contingencies [Line Items] |  |  |  |  |
Current | 38 | 42 |  |  |
Long-term | 93 | 87 |  |  |
Total | 131 | 129 |  |  |
Occupational |  |  |  |  |
Contingencies [Line Items] |  |  |  |  |
Current | 11 | 6 |  |  |
Long-term | 54 | 52 |  |  |
Total | 65 | 58 |  |  |
Environmental |  |  |  |  |
Contingencies [Line Items] |  |  |  |  |
Current | 23 | 31 |  |  |
Long-term | 53 | 43 |  |  |
Total | 76 | 74 |  | 80 | 90
Other |  |  |  |  |
Contingencies [Line Items] |  |  |  |  |
Current | 18 | 21 |  |  |
Long-term | 24 | 23 |  |  |
Total | $ 42 | $ 44 |  | $ 45 | $ 56
[1] | Certain prior year data has been reclassified to conform to the current presentation.

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