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Pension, Retiree Medical and Savings Plans (Estimated Future Benefit Payments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Discretionary [1] $ 0 $ 407 $ 23
Non-discretionary 162 184 177
Employer contributions/funding 162 591 200
2016 755    
2017 780    
2018 835    
2019 880    
2020 930    
2021-25 5,335    
Retiree Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Discretionary [1] 0 0 0
Non-discretionary 43 64 62
Employer contributions/funding 43 $ 64 $ 62
2016 [2] 120    
2017 [2] 120    
2018 [2] 120    
2019 [2] 120    
2020 [2] 115    
2021-25 [2] 535    
Years 2016 Through 2020      
Defined Benefit Plan Disclosure [Line Items]      
Subsidies expected to be received under the 2003 Medicare Act 3    
Years 2016 Through 2020, minimum amount [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Subsidies expected to be received under the 2003 Medicare Act 0    
Years 2021 Through 2025      
Defined Benefit Plan Disclosure [Line Items]      
Subsidies expected to be received under the 2003 Medicare Act $ 9    
Large Cap Funds In United States Commingled Funds [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Representation As Percentage Of Total US Plan Assets 18.00% 25.00%  
[1] Includes $388 million in 2014 pertaining to pension lump sum payments.
[2] Expected future benefit payments for our retiree medical plans do not reflect any estimated subsidies expected to be received under the 2003 Medicare Act. Subsidies are expected to be approximately $2 to $3 million for each of the years from 2016 through 2020 and approximately $9 million in total for 2021 through 2025.