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Pension, Retiree Medical and Savings Plans (Selected Information About Plans with Liability for Service to Date and Total Benefit Liability in Excess of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
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United States Pension Plan of US Entity, Defined Benefit |  |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets |  |  |
Liability for service to date | $ (6,536) | $ (661) |
Fair value of plan assets | 5,698 | 2 |
Selected information for plans with projected benefit liability in excess of plan assets |  |  |
Benefit liability | (13,033) | (7,385) |
Fair value of plan assets | 11,397 | 6,103 |
Defined Benefit Plan, Fair Value of Plan Assets | 11,397 | 12,224 | $ 11,462
International |  |  |
Selected information for plans with accumulated benefit obligation in excess of plan assets |  |  |
Liability for service to date | (155) | (333) |
Fair value of plan assets | 112 | 288 |
Selected information for plans with projected benefit liability in excess of plan assets |  |  |
Benefit liability | (511) | (2,865) |
Fair value of plan assets | 406 | 2,583 |
Defined Benefit Plan, Fair Value of Plan Assets | 2,823 | 3,002 | 2,777
Retiree Medical Plan |  |  |
Selected information for plans with projected benefit liability in excess of plan assets |  |  |
Benefit liability | (1,300) | (1,439) |
Fair value of plan assets |  | 415 |
Defined Benefit Plan, Fair Value of Plan Assets | $ 354 | $ 415 | $ 406

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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 If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate benefit obligation for plans with benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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