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Casualty, Environmental and Other Reserves - Schedule of Casualty, Environmental and Other Reserves (Details) - USD ($) $ in Millions | Sep. 25, 2015 | Dec. 26, 2014
--- | --- | ---
Loss Contingencies [Line Items] |  |
Current | $ 146 | $ 142
Long-term | 270 | 276
Total | 416 | 418
Total Casualty |  |
Loss Contingencies [Line Items] |  |
Current | 66 | 76
Long-term | 207 | 189
Total | 273 | 265
Personal Injury |  |
Loss Contingencies [Line Items] |  |
Current | 58 | 68
Long-term | 145 | 123
Total | 203 | 191
Occupational |  |
Loss Contingencies [Line Items] |  |
Current | 3 | 3
Long-term | 14 | 15
Total | 17 | 18
Asbestos |  |
Loss Contingencies [Line Items] |  |
Current | 5 | 5
Long-term | 48 | 51
Total | 53 | 56
Environmental |  |
Loss Contingencies [Line Items] |  |
Current | 58 | 48
Long-term | 30 | 46
Total | 88 | 94
Other |  |
Loss Contingencies [Line Items] |  |
Current | 22 | 18
Long-term | 33 | 41
Total | $ 55 | $ 59

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