Retirement Plans (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2011	Oct. 02, 2010	Oct. 01, 2011	Oct. 02, 2010
Pension Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost
Service cost	$ 32	$ 31	$ 96	$ 93
Interest cost	82	79	246	237
Expected return on plan assets	(98)	(92)	(294)	(276)
Amortization of prior service cost (credit)	4	4	12	12
Amortization of net loss	19	9	57	27
Net periodic benefit cost	39	31	117	93
Other Postretirement Benefit Plans Defined Benefit [Member]
Defined Benefit Plan Net Periodic Benefit Cost
Service cost	2	2	6	6
Interest cost	8	9	24	25
Amortization of prior service cost (credit)	(2)	(2)	(5)	(4)
Amortization of net loss	3	3	9	9
Net periodic benefit cost	$ 11	$ 12	$ 34	$ 36