Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Pension Benefits [Member]
Components of expense/ (income) related to net benefit expense:
Service Cost	$ 11	$ 12	$ 33	$ 37
Interest Cost	30	27	92	81
Expected Return on Plan Assets	(41)	(41)	(124)	(122)
Amortization of Net Loss	15	25	43	75
Total Expense	15	23	44	71
Other Post-retirement Benefits [Member]
Components of expense/ (income) related to net benefit expense:
Service Cost	1	1	2	3
Interest Cost	4	3	11	9
Amortization of Net Loss	5	3	4	10
Amortization of Prior Service Costs	(4)	0	(1)	(1)
Total Expense	$ 6	$ 7	$ 16	$ 21