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Pension, Retiree Medical and Savings Plans (Categorized Plan Assets Measured at Fair Value) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 27, 2014
Dec. 28, 2013
Dec. 29, 2012
U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 12,639us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,002us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Retiree Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 415us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Savings Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Cost Recognized 130us-gaap_DefinedContributionPlanCostRecognized
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U.S. Common Stock | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 966us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Common Stock | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Common Stock | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 966us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Common Stock | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Common Stock | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Common Stock | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Common Stock | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Common Stock | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Commingled Funds | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,437us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Commingled Funds | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Commingled Funds | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Commingled Funds | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Commingled Funds | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 3,437us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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U.S. Commingled Funds | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Commingled Funds | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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U.S. Commingled Funds | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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International Common Stock [Member] | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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International Common Stock [Member] | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 171us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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International Common Stock [Member] | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 1,488us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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International Common Stock [Member] | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 171us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Preferred Stock | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Defined Benefit Plan Disclosure [Line Items]      
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Large-Cap Fund(s) In U.S. Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
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[1] 2014 and 2013 amounts include $415 million and $406 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 quoted market prices in active markets.
[3] Based on the fair value of the investments owned by these funds that track various U.S. large, mid-cap and small company indices.
[4] Includes one large-cap fund that represents 25% of total U.S. plan assets for both 2014 and 2013.
[5] Based on the fair value of the investments owned by these funds that track various non-U.S. equity indices.
[6] Based on quoted bid prices for comparable securities in the marketplace and broker/dealer quotes in active markets.
[7] Corporate bonds of U.S.-based companies represent 23% and 21%, respectively, of total U.S. plan assets for 2014 and 2013.
[8] Based on the fair value of the contracts as determined by the insurance companies using inputs that are not observable.
[9] Based on the fair value of the investments owned by these funds that track various government and corporate bond indices.
[10] Based on the fair value of the investments owned by this fund that invests primarily in derivatives to hedge currency exposure.
[11] Based on the appraised value of the investments owned by these funds as determined by independent third parties using inputs that are not observable.