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Pension, Retiree Medical and Savings Plans (Weighted-Average Assumptions to Determine Projected Benefit Liability and Benefit Expense for Pension and Retiree Medical Plans) (Details)
 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]      
Liability discount rate 4.50% 4.20% 5.00%
Expense discount rate 4.20% 5.00% 4.20%
Expected return on plan assets 7.50% 7.50% 7.80%
Liability rate of salary increases 3.10% 3.50% 3.70%
Expense rate of salary increases 3.50% 3.70% 3.70%
International      
Defined Benefit Plan Disclosure [Line Items]      
Liability discount rate 4.00% 3.80% 4.70%
Expense discount rate 3.80% 4.70% 4.40%
Expected return on plan assets 6.50% 6.60% 6.60%
Liability rate of salary increases 3.60% 3.60% 3.90%
Expense rate of salary increases 3.60% 3.90% 3.90%
Retiree Medical Plan      
Defined Benefit Plan Disclosure [Line Items]      
Liability discount rate 4.20% 3.80% 4.60%
Expense discount rate 3.80% 4.30% 3.70%
Expected return on plan assets 7.50% 7.50% 7.80%