Retirement Plans (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Jul. 02, 2011	Jul. 03, 2010
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost
Service cost	$ 32	$ 31	$ 64	$ 62
Interest cost	82	79	164	158
Expected return on plan assets	(98)	(92)	(196)	(184)
Amortization of prior service cost (credit)	4	4	8	8
Amortization of net loss	19	9	38	18
Net periodic benefit cost	39	31	78	62
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost
Service cost	2	2	4	4
Interest cost	8	8	16	16
Amortization of prior service cost (credit)	(2)	(1)	(3)	(2)
Amortization of net loss	3	3	6	6
Net periodic benefit cost	$ 11	$ 12	$ 23	$ 24