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Casualty, Environmental and Other Reserves - Balance Sheet Presentation (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 30, 2016 | Dec. 25, 2015
--- | --- | --- | --- | ---
Contingencies [Line Items] |  |  |  |
Current | $ 113 | $ 108 |  |
Long-term | 211 | 266 |  |
Total | 324 | 374 | $ 374 | $ 400
Casualty Reserves |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 50 | 49 |  |
Long-term | 149 | 179 |  |
Total | 199 | 228 | 229 | 269
Personal Injury |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 40 | 43 |  |
Long-term | 103 | 125 |  |
Total | 143 | 168 |  |
Occupational |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 10 | 6 |  |
Long-term | 46 | 54 |  |
Total | 56 | 60 |  |
Environmental |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 39 | 31 |  |
Long-term | 41 | 59 |  |
Total | 80 | 90 | 95 | 82
Other Reserves |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 24 | 28 |  |
Long-term | 21 | 28 |  |
Total | $ 45 | $ 56 | $ 50 | $ 49

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