Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 25, 2016	Mar. 27, 2015
Pension Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	$ 12	$ 11
Interest Cost	30	29
Expected Return on Plan Assets	(39)	(40)
Amortization of Net Loss	12	17
Net Periodic Benefit Cost	15	17
Special Termination Benefits – Workforce Reduction Program	0	7
Total Expense	15	24
Other Post-retirement Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	0	1
Interest Cost	3	4
Amortization of Net Loss	1	1
Total Expense	$ 4	$ 6