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Casualty, Environmental and Other Reserves (Loss Contingencies Accrual) (Details) - USD ($) $ in Millions | Dec. 25, 2015 | Dec. 26, 2014 | Dec. 27, 2013 | Dec. 28, 2012
--- | --- | --- | --- | ---
Contingencies [Line Items] |  |  |  |
Current | $ 131 | $ 142 |  |
Long-term | 269 | 276 |  |
Casualty [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 69 | 76 |  |
Long-term | 200 | 189 |  |
Total | 269 | 265 | $ 280 | $ 325
Personal Injury [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 57 | 68 |  |
Long-term | 147 | 123 |  |
Total | 204 | 191 |  |
Asbestos [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 9 | 5 |  |
Long-term | 44 | 51 |  |
Total | 53 | 56 |  |
Occupational [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 3 | 3 |  |
Long-term | 9 | 15 |  |
Total | 12 | 18 |  |
Environmental [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 42 | 48 |  |
Long-term | 40 | 46 |  |
Total | 82 | 94 | 100 | 88
Other Reserves [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 20 | 18 |  |
Long-term | 29 | 41 |  |
Total | 49 | 59 | 71 | 64
Casualty, Environmental and Other [Member] |  |  |  |
Contingencies [Line Items] |  |  |  |
Current | 131 | 142 |  |
Long-term | 269 | 276 |  |
Total | $ 400 | $ 418 | $ 451 | $ 477

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- Definition Contingencies [Line Items] + References No definition available. + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of loss contingency liability expected to be resolved within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Definition Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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