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Pension, Retiree Medical and Savings Plans Pension, Retiree Medical and Savings Plans (Target Asset Allocations) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Fixed Income |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  |  | 40.00% |  |
U.S. Equity |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  |  | 33.00% |  |
International Equity |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  |  | 22.00% |  |
Real Estate Funds [Member] |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  |  | 5.00% |  |
Scenario, Forecast | Fixed Income |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  | 40.00% |  |  |
Scenario, Forecast | U.S. Equity |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  | 33.00% |  |  |
Scenario, Forecast | International Equity |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  | 22.00% |  |  |
Scenario, Forecast | Real Estate Funds [Member] |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Target investment allocation percentage |  | 5.00% |  |  |
United States Pension Plan of US Entity, Defined Benefit |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  |  | $ 11,397 | $ 12,224 | $ 11,462
United States Pension Plan of US Entity, Defined Benefit | Real Estate Funds [Member] |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [1],[2] |  | $ 735 | $ 629 |
[1] | 2015 and 2014 amounts include $354 million and $415 million, respectively, of retiree medical plan assets that are restricted for purposes of providing health benefits for U.S. retirees and their beneficiaries.
[2] | Based on the appraised value of the investments owned by these funds as determined by independent third parties using inputs that are not observable.

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=49178875&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Target allocation of investments of this type to total plan assets presented on a weighted average basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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