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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, 2017 | Dec. 31, 2016 | Dec. 26, 2015 | Dec. 27, 2014
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 [Member] | Fixed Income |  |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |  |
Target investment allocation percentage |  | 40.00% |  |  |  |
Scenario, Forecast [Member] | U.S. Equity |  |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |  |
Target investment allocation percentage |  | 33.00% |  |  |  |
Scenario, Forecast [Member] | International Equity |  |  |  |  |  |
Target Asset Allocation [Line Items] |  |  |  |  |  |
Target investment allocation percentage |  | 22.00% |  |  |  |
Scenario, Forecast [Member] | 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 |  |  | $ 11,458 |  | $ 11,397 | $ 12,224
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 | [2] |  | $ 651 | [1] | $ 735 |
[1] | 2016 and 2015 amounts include $320 million and $354 million, respectively, of retiree medical plan assets that are restricted for purposes of providing health benefits for U.S. retirees and their beneficiaries.
[2] | The real estate commingled funds include investments in limited partnerships. These funds are based on the net asset value of the appraised value of investments owned by these funds as determined by independent third parties using inputs that are not observable. The majority of the funds are redeemable quarterly subject to availability of cash and have notice periods ranging from 45 to 90 days.

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + 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=64937038&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=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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