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Casualty, Environmental and Other Reserves (Asbestos and Occupational Claims) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 25, 2015 USD ($) claim | Dec. 26, 2014 USD ($) claim
Loss Contingency, Claims Quantities [Roll Forward] |  |
Asserted Claims Percentage | 20.00% |
Unasserted Claims Percentage | 80.00% |
Occupational Casualty and Asbestos Issues [Member] |  |
Loss Contingency, Claims Quantities [Roll Forward] |  |
Open Claims - Beginning of Year | 177 | 251
New Claims Filed | 77 | 106
Claims Settled | (64) | (95)
Claims Dismissed | (30) | (85)
Open Claims - End of Year | 160 | 177
Asbestos [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency, latency period (in years) | 10 years |
Total liability | $ | $ 53 | $ 56
Asbestos Casualty [Member] |  |
Loss Contingencies [Line Items] |  |
Loss Contingency, Prior Estimate, Period | 7 years |
Time period for estimating probable claims (in years) | 10 years |
Minimum [Member] | Asbestos [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency, latency period (in years) | 10 years |
Maximum [Member] | Asbestos [Member] |  |
Loss Contingencies [Line Items] |  |
Loss contingency, latency period (in years) | 40 years |

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