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Casualty, Environmental and Other Reserves - Balance Sheet Presentation (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016
--- | --- | --- | --- | ---
Contingencies [Line Items] |  |  |  |
Current | $ 100 | $ 113 |  |
Long-term | 205 | 211 |  |
Total | 305 | 324 | $ 374 | $ 374
Casualty |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 48 | 50 |  |
Long-term | 139 | 149 |  |
Total | 187 | 199 | 228 | 229
Personal Injury |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 42 | 40 |  |
Long-term | 87 | 103 |  |
Total | 129 | 143 |  |
Occupational |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 6 | 10 |  |
Long-term | 52 | 46 |  |
Total | 58 | 56 |  |
Environmental |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 31 | 39 |  |
Long-term | 43 | 41 |  |
Total | 74 | 80 | 90 | 95
Other |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 21 | 24 |  |
Long-term | 23 | 21 |  |
Total | $ 44 | $ 45 | $ 56 | $ 50

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