Employee Benefit Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 24, 2016	Jun. 26, 2015	Jun. 24, 2016	Jun. 26, 2015
Pension Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	$ 12	$ 11	$ 24	$ 22
Interest Cost	30	29	60	58
Expected Return on Plan Assets	(40)	(41)	(79)	(81)
Amortization of Net Loss	12	18	24	35
Net Periodic Benefit Cost	14	17	29	34
Special Termination Benefits – Workforce Reduction Program	0	0	0	7
Total Expense	14	17	29	41
Other Post-retirement Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	1	0	1	1
Interest Cost	3	3	6	7
Amortization of Net Loss	0	1	1	2
Total Expense	$ 4	$ 4	$ 8	$ 10