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Casualty, Environmental and Other Reserves (Casualty, Environmental and Other Reserves Activity) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 25, 2015 | Dec. 26, 2014 | Dec. 27, 2013
Casualty Reserves [Member] |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Balance at beginning of period | $ 265 | $ 280 |  | $ 325
Charged to Expense | 60 | 89 | [1] | 54
Payments | (56) | (104) |  | (99)
Balance end of period | 269 | 265 |  | 280
Environmental Reserves [Member] |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Balance at beginning of period | 94 | 100 |  | 88
Charged to Expense | 45 | 57 | [1] | 48
Payments | (57) | (63) |  | (36)
Balance end of period | 82 | 94 |  | 100
Other Reserves [Member] |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Balance at beginning of period | 59 | 71 |  | 64
Charged to Expense | 37 | 30 | [1] | 38
Payments | (47) | (42) |  | (31)
Balance end of period | 49 | 59 |  | 71
Casualty, Environmental and Other [Member] |  |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |  |
Balance at beginning of period | 418 | 451 |  | 477
Charged to Expense | 142 | 176 | [1] | 140
Payments | (160) | (209) |  | (166)
Balance end of period | $ 400 | $ 418 |  | $ 451
[1] | Increase in expense in 2014 is primarily due to the resolution of personal injury claims for prior years.

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- Definition Accrual for Loss Contingencies, Provision + 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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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