Employee Benefits (Components of Company Plan Benefit Expense) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 02, 2011	Jun. 30, 2012	Jul. 02, 2011
Pension [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 26	$ 23	$ 54	$ 49
Interest cost	52	53	103	105
Expected return on plan assets	(91)	(94)	(183)	(186)
Amortization of unrecognized prior service cost (credit)	3	3	7	7
Recognized net loss	35	26	71	52
Settlement cost	0	3	0	4
Total expense	25	14	52	31
Other Nonpension Postretirement [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	7	5	13	11
Interest cost	13	15	26	31
Expected return on plan assets	(22)	(22)	(44)	(44)
Amortization of unrecognized prior service cost (credit)	0	0	0	(1)
Recognized net loss	3	5	7	10
Total expense	1	3	2	7
Postemployment [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	1	4	3
Interest cost	1	1	2	2
Recognized net loss	1	1	2	2
Total expense	$ 4	$ 3	$ 8	$ 7