Employee Benefit Plans (Net Benefit Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 25, 2015	Dec. 26, 2014	Dec. 27, 2013
Pension Benefits [Member]
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	$ 45	$ 44	$ 49
Interest Cost	116	123	108
Expected Return on Plan Assets	(162)	(166)	(162)
Amortization of Net Loss	70	57	100
Amortization of Prior Service Cost	0	0	0
Net Periodic Benefit Expense	69	58	95
Special Termination Benefits - Workforce Reduction Program/Curtailment	7	27	0
Settlement Gain	(2)	(1)	(2)
Total Expense	74	84	93
Post-retirement Benefits [Member]
Components of expense/ (income) related to net benefit expense [Abstract]
Service Cost	2	3	3
Interest Cost	12	13	13
Expected Return on Plan Assets	0	0	0
Amortization of Net Loss	4	5	14
Amortization of Prior Service Cost	(1)	(1)	(1)
Net Periodic Benefit Expense	17	20	29
Special Termination Benefits - Workforce Reduction Program/Curtailment	0	8	0
Settlement Gain	0	0	0
Total Expense	$ 17	$ 28	$ 29