Employee Benefits (Components of Company Plan Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 28	$ 23	$ 82	$ 72
Interest cost	52	52	155	157
Expected return on plan assets	(93)	(91)	(276)	(277)
Amortization of unrecognized prior service cost (credit)	4	4	11	11
Recognized net loss	38	27	109	79
Settlement cost	0	3	0	7
Total expense	29	18	81	49
Other Nonpension Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	6	20	17
Interest cost	14	16	40	47
Expected return on plan assets	(22)	(22)	(66)	(66)
Amortization of unrecognized prior service cost (credit)	(2)	(1)	(2)	(2)
Recognized net loss	5	5	12	15
Total expense	2	4	4	11
Postemployment [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	1	2	5	5
Interest cost	1	1	3	3
Recognized net loss	2	1	4	3
Total expense	$ 4	$ 4	$ 12	$ 11