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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Mar. 25, 2016 | Dec. 25, 2015
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 130 | $ 131
Long-term | 255 | 269
Total | 385 | 400
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 68 | 69
Long-term | 190 | 200
Total | 258 | 269
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 57 | 57
Long-term | 143 | 147
Total | 200 | 204
Asbestos |  |
Loss Contingencies [Line Items] |  |
Current | 8 | 9
Long-term | 39 | 44
Total | 47 | 53
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 3 | 3
Long-term | 8 | 9
Total | 11 | 12
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 43 | 42
Long-term | 37 | 40
Total | 80 | 82
Other |  |
Loss Contingencies [Line Items] |  |
Current | 19 | 20
Long-term | 28 | 29
Total | $ 47 | $ 49

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