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Pension, Retiree Medical and Savings Plans (Categorized Plan Assets Measured at Fair Value) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Cost Recognized $ 148 $ 130 $ 122
U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 11,397 12,224 11,462
International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,823 3,002 $ 2,777
US Plan Assets [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 11,751 12,639  
U.S. Common Stock | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 1,415 966  
U.S. Common Stock | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 4 5  
U.S. Common Stock | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 1,415    
U.S. Common Stock | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 4    
U.S. Common Stock | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 0    
U.S. Common Stock | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0    
U.S. Common Stock | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 0    
U.S. Common Stock | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0    
U.S. Commingled Funds | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[3],[4] 2,369 3,437  
U.S. Commingled Funds | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [3] 198 373  
U.S. Commingled Funds | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[3],[4] 0    
U.S. Commingled Funds | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [3] 0    
U.S. Commingled Funds | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[3],[4] 2,369    
U.S. Commingled Funds | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [3] 198    
U.S. Commingled Funds | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[3],[4] 0    
U.S. Commingled Funds | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [3] 0    
International Common Stock [Member] | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 1,203 1,488  
International Common Stock [Member] | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 148 171  
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],[2] 1,203    
International Common Stock [Member] | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 148    
International Common Stock [Member] | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 0    
International Common Stock [Member] | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0    
International Common Stock [Member] | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[2] 0    
International Common Stock [Member] | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [2] 0    
International Commingled Fund | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[5] 1,113 876  
International Commingled Fund | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [5] 1,142 918  
International Commingled Fund | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[5] 0    
International Commingled Fund | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [5] 0    
International Commingled Fund | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[5] 1,113    
International Commingled Fund | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [5] 1,142    
International Commingled Fund | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[5] 0    
International Commingled Fund | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [5] 0    
Preferred Stock | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 9 22  
Preferred Stock | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0 1  
Preferred Stock | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 0    
Preferred Stock | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0    
Preferred Stock | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 9    
Preferred Stock | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0    
Preferred Stock | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 0    
Preferred Stock | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0    
Government Securities | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 1,181 1,279  
Government Securities | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 433 $ 454  
Government Securities | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 0    
Government Securities | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0    
Government Securities | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 1,181    
Government Securities | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 433    
Government Securities | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 0    
Government Securities | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0    
Corporate Bonds      
Defined Benefit Plan Disclosure [Line Items]      
Representation of one fund in total U.S. plan assets   23.00%  
Corporate Bonds | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6],[7] 3,191 $ 3,338  
Corporate Bonds | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 439 320  
Corporate Bonds | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6],[7] 0    
Corporate Bonds | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0    
Corporate Bonds | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6],[7] 3,191    
Corporate Bonds | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 439    
Corporate Bonds | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6],[7] 0    
Corporate Bonds | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [6] 0    
Mortgage-Backed Securities | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 207 274  
Mortgage-Backed Securities | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 0    
Mortgage-Backed Securities | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 207    
Mortgage-Backed Securities | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[6] 0    
Contracts With Insurance Companies | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[8] 7 6  
Contracts With Insurance Companies | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [8] 32 36  
Contracts With Insurance Companies | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[8] 0    
Contracts With Insurance Companies | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [8] 0    
Contracts With Insurance Companies | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[8] 0    
Contracts With Insurance Companies | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [8] 0    
Contracts With Insurance Companies | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[8] 7    
Contracts With Insurance Companies | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [8] 32    
Cash And Cash Equivalents | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 267 267  
Cash And Cash Equivalents | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12 21  
Cash And Cash Equivalents | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 267    
Cash And Cash Equivalents | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 12    
Cash And Cash Equivalents | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 0    
Cash And Cash Equivalents | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0    
Cash And Cash Equivalents | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 0    
Cash And Cash Equivalents | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 0    
Sub-Total U.S. Plan Assets | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 11,697 12,582  
Sub-Total U.S. Plan Assets | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 2,885    
Sub-Total U.S. Plan Assets | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 8,070    
Sub-Total U.S. Plan Assets | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 742    
Fixed Income Commingled Funds | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [9] 308 517  
Fixed Income Commingled Funds | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [9] 0    
Fixed Income Commingled Funds | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [9] 308    
Fixed Income Commingled Funds | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [9] 0    
Currency Commingled Funds | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [10] 0 87  
Currency Commingled Funds | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [10] 0    
Currency Commingled Funds | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [10] 0    
Currency Commingled Funds | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [10] 0    
Real Estate Funds [Member] | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[11] 735 629  
Real Estate Funds [Member] | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [11] 100 92  
Real Estate Funds [Member] | Level 1 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[11] 0    
Real Estate Funds [Member] | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [11] 0    
Real Estate Funds [Member] | Level 2 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[11] 0    
Real Estate Funds [Member] | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [11] 0    
Real Estate Funds [Member] | Level 3 | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1],[11] 735    
Real Estate Funds [Member] | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [11] 100    
Sub-Total International Plan Assets | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,816 2,995  
Sub-Total International Plan Assets | Level 1 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 164    
Sub-Total International Plan Assets | Level 2 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 2,520    
Sub-Total International Plan Assets | Level 3 | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets 132    
Dividends And Interest Receivable | U.S. Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets [1] 54 57  
Dividends And Interest Receivable | International Plan Assets      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Fair Value of Plan Assets $ 7 $ 7  
Large-Cap Fund(s) In U.S. Commingled Funds      
Defined Benefit Plan Disclosure [Line Items]      
Representation of one fund in total U.S. plan assets 18.00% 25.00%  
[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 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 18% and 25% of total U.S. plan assets for 2015 and 2014, respectively.
[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% of total U.S. plan assets for both 2015 and 2014.
[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.