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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