Employee Benefit Plans - Schedule of Net Benefit Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 30, 2016	Dec. 25, 2015	Dec. 26, 2014
Pension Plans
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	$ 48	$ 45	$ 44
Interest Cost	119	116	123
Expected Return on Plan Assets	(157)	(162)	(166)
Amortization of Net Loss	48	70	57
Amortization of Prior Service Cost	0	0	0
Net Periodic Benefit Expense	58	69	58
Special Termination Benefits - Workforce Reduction Program/Curtailment	0	7	27
Settlement Gain	(1)	(2)	(1)
Total Expense	57	74	84
Post-retirement Medical Plan
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	2	2	3
Interest Cost	12	12	13
Expected Return on Plan Assets	0	0	0
Amortization of Net Loss	3	4	5
Amortization of Prior Service Cost	0	(1)	(1)
Net Periodic Benefit Expense	17	17	20
Special Termination Benefits - Workforce Reduction Program/Curtailment	0	0	8
Settlement Gain	0	0	0
Total Expense	$ 17	$ 17	$ 28