Employee Benefit Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 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	13,000,000	11,000,000	25,000,000	22,000,000
Interest Cost	27,000,000	30,000,000	54,000,000	61,000,000
Expected Return on Plan Assets	(41,000,000)	(42,000,000)	(81,000,000)	(81,000,000)
Amortization of Net Loss	25,000,000	21,000,000	50,000,000	41,000,000
Total Expense	24,000,000	20,000,000	48,000,000	43,000,000
Other Post-retirement Benefits [Member]
Components of expense/ (income) related to net benefit expense:
Service Cost	1,000,000	1,000,000	2,000,000	2,000,000
Interest Cost	3,000,000	4,000,000	6,000,000	8,000,000
Amortization of Net Loss	4,000,000	3,000,000	7,000,000	5,000,000
Amortization of Prior Service Costs	(1,000,000)	(1,000,000)	(1,000,000)	(1,000,000)
Total Expense	$ 7,000,000	$ 7,000,000	$ 14,000,000	$ 14,000,000