Employee Benefit Plans - Components of Expense/(Income) Related to Net Benefit Expense (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 23, 2016	Sep. 25, 2015	Sep. 23, 2016	Sep. 25, 2015
Pension Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	$ 12	$ 12	$ 36	$ 34
Interest Cost	29	29	89	87
Expected Return on Plan Assets	(39)	(41)	(118)	(122)
Amortization of Net Loss	12	17	36	52
Net Periodic Benefit Cost	14	17	43	51
Special Termination Benefits – Workforce Reduction Program	0	0	0	7
Total Expense	14	17	43	58
Other Post-retirement Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	0	2	1	3
Interest Cost	3	3	9	10
Amortization of Net Loss	1	1	2	3
Amortization of Prior Service Costs	0	(1)	0	(1)
Total Expense	$ 4	$ 5	$ 12	$ 15