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Pension, Retiree Medical and Savings Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 26, 2015 | Dec. 27, 2014 | Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items] |  |  |
Lower limit of net accumulated gain or loss | 10.00% |  |
Average remaining service period of active plan participants, pension expense | 11 years |  |
Average remaining service period of active plan participants, retiree medical expense | 8 years |  |
Expected future employer contributions in 2015 | $ 215 |  |
Pension strategy investment term, years | 5 years |  |
Average increase in the cost of covered retiree medical benefits | 6.00% | 6.00% |
Average increase is then projected to decline | 5.00% | 5.00% |
Defined Contribution Plan, Cost Recognized | $ 148 | $ 130 | $ 122
Net impact of mortality and other changes |  | 150 |
Pension Plans, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Unfunded plans included in total projected benefit liability | 780 |  |
Employer contributions | 162 | $ 591 | $ 200
Retiree Medical Plan |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected future employer contributions in 2015 | $ 65 |  |
Expected return on plan assets | 7.50% | 7.50% | 7.80%
Employer contributions | $ 43 | $ 64 | $ 62
United States Pension Plan of US Entity, Defined Benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Expected return on plan assets | 7.50% | 7.50% | 7.80%
Employer contributions | $ 66 | $ 434 |
Discretionary contribution to fund pension settlement |  | 388 |
Pre-tax non-cash settlement charge |  | 141 |
Pre-tax non-cash settlement charge, after-tax |  | $ 88 |
Pre-tax non-cash settlement charge, net of tax, per share |  | $ 0.06 |

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- Definition Defined Benefit Plan, Expected Return on Certain Assets, Computation, Moving Average Term + References No definition available. + Details
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- Definition Defined Benefit Plan, Recognized Net Gain (Loss) Due to Settlements, Net of Tax, Per Share + References No definition available. + Details
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- Definition Defined Benefit Plan Unfunded Plan Benefit Obligations + References No definition available. + Details
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- Definition Payments for Defined Benefit Plan Settlement + References No definition available. + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512046 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of net gain (loss) recognized in net periodic benefit cost as a result of an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include, but are not limited to, lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contracts to cover vested benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 15 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7577095&loc=d3e8001-114927 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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