Employee Benefit Plans - Components of Expense/(Income) Related to Net Benefit Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 24, 2016	Jun. 30, 2017	Jun. 24, 2016
Pension Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	$ 9	$ 12	$ 20	$ 24
Interest Cost	23	30	46	60
Expected Return on Plan Assets	(43)	(40)	(85)	(79)
Amortization of Net Loss	10	12	21	24
Net Periodic Benefit Cost	(1)	14	2	29
Special Termination Benefits - Management Workforce Reduction/Curtailment	7	0	57	0
Total Expense	6	14	59	29
Other Post-retirement Benefits
Components of expense/ (income) related to net benefit expense:
Service Cost	1	1	1	1
Interest Cost	2	3	4	6
Amortization of Net Loss	0	0	0	1
Net Periodic Benefit Cost	3	4	5	8
Special Termination Benefits - Management Workforce Reduction/Curtailment	0	0	13	0
Total Expense	$ 3	$ 4	$ 18	$ 8