Pension, Retiree Medical and Savings Plans (Estimated Amounts to be Amortized from Accumulated Other Comprehensive Loss into Benefit Expense in 2012 for Pension and Retiree Medical Plans) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 27, 2014
United States Pension Plan of US Entity, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Payments for Defined Benefit Plan Settlement	$ 452	$ 388
Net loss/(gain)	122
Prior service cost/(credit)	1
Total	123
International
Defined Benefit Plan Disclosure [Line Items]
Net loss/(gain)	51
Total	51
Retiree Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Net loss/(gain)	(12)
Prior service cost/(credit)	(25)
Total	$ (37)