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Pension, Retiree Medical and Savings Plans (Components of Benefit Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 26, 2015
Dec. 27, 2014
Dec. 28, 2013
United States Pension Plan of US Entity, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Pre-tax non-cash settlement charge   $ 141  
Service cost $ 435 393 $ 467
Interest cost 546 580 527
Expected return on plan assets (850) (784) (823)
Amortization of prior service (credit)/cost (3) 21 18
Amortization of net loss/(gain) 205 175 289
Gross total 333 385 478
Settlement/curtailment loss/(gain) (a) [1]   141 (4)
Special termination benefits 18 24 22
Total 351 550 496
International      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 99 98 111
Interest cost 115 131 118
Expected return on plan assets (174) (176) (157)
Amortization of prior service (credit)/cost     1
Amortization of net loss/(gain) 71 53 66
Gross total 111 106 139
Settlement/curtailment loss/(gain) (a) [1] 3 7 7
Special termination benefits 1    
Total 115 113 146
Retiree Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 35 36 45
Interest cost 52 58 54
Expected return on plan assets (27) (27) (27)
Amortization of prior service (credit)/cost (39) (28) (23)
Amortization of net loss/(gain) 2 (4) 1
Gross total 23 35 50
Special termination benefits 1 3 2
Total $ 24 $ 38 $ 52
[1] U.S. includes a pension lump sum settlement charge of $141 million in 2014. See additional unaudited information in “Items Affecting Comparability” in Management’s Discussion and Analysis of Financial Condition and Results of Operations.