Employee Benefit Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 27, 2013	Sep. 28, 2012	Sep. 27, 2013	Sep. 28, 2012
Components of expense/ (income) related to net benefit expense:
Employer contribution to qualified pension plans, required minimum amount			$ 0
Pension Benefits [Member]
Components of expense/ (income) related to net benefit expense:
Service Cost	12,000,000	11,000,000	37,000,000	33,000,000
Interest Cost	27,000,000	31,000,000	81,000,000	92,000,000
Expected Return on Plan Assets	(41,000,000)	(43,000,000)	(122,000,000)	(124,000,000)
Amortization of Net Loss	25,000,000	21,000,000	75,000,000	62,000,000
Total Expense	23,000,000	20,000,000	71,000,000	63,000,000
Other Post-retirement Benefits [Member]
Components of expense/ (income) related to net benefit expense:
Service Cost	1,000,000	1,000,000	3,000,000	3,000,000
Interest Cost	3,000,000	4,000,000	9,000,000	12,000,000
Amortization of Net Loss	3,000,000	2,000,000	10,000,000	7,000,000
Amortization of Prior Service Costs	0	0	(1,000,000)	(1,000,000)
Total Expense	$ 7,000,000	$ 7,000,000	$ 21,000,000	$ 21,000,000