Pensions and Other Postretirement Benefits (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jul. 03, 2011	Jul. 04, 2010	Jul. 03, 2011	Jul. 04, 2010
Retirement Plans [Member]
Components of net periodic benefit cost
Service cost	$ 144	$ 121	$ 287	$ 247
Interest cost	214	194	427	394
Expected return on plan assets	(277)	(248)	(555)	(500)
Amortization of prior service cost/ (credit)	1	3	4	6
Amortization of net transition obligation	1	1	1	1
Recognized actuarial losses	98	59	194	117
Net periodic benefit cost	181	130	358	265
Other Benefit Plans [Member]
Components of net periodic benefit cost
Service cost	37	33	74	67
Interest cost	46	50	94	100
Expected return on plan assets	(1)	(1)	(1)	(1)
Amortization of prior service cost/ (credit)		(1)	(1)	(2)
Recognized actuarial losses	12	13	23	25
Net periodic benefit cost	$ 94	$ 94	$ 189	$ 189