Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 27, 2014	Jun. 28, 2013	Jun. 27, 2014	Jun. 28, 2013
Pension Benefits [Member]
Components of expense/ (income) related to net benefit expense:
Service Cost	$ 11	$ 13	$ 22	$ 25
Interest Cost	31	27	62	54
Expected Return on Plan Assets	(42)	(41)	(83)	(81)
Amortization of Net Loss	14	25	28	50
Total Expense	14	24	29	48
Other Post-retirement Benefits [Member]
Components of expense/ (income) related to net benefit expense:
Service Cost	0	1	1	2
Interest Cost	4	3	7	6
Amortization of Net Loss	2	4	3	7
Amortization of Prior Service Costs	(1)	(1)	(1)	(1)
Total Expense	$ 5	$ 7	$ 10	$ 14