Pension and Other Postretirement Benefits (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2011	Jun. 25, 2010	Jul. 01, 2011	Jun. 25, 2010
Pension Plans [Member]
Components of net periodic benefit cost:
Service cost	$ 28	$ 25	$ 56	$ 49
Interest cost	32	30	64	60
Expected return on plan assets	(35)	(28)	(70)	(56)
Amortization of prior service costs (credits)		1		2
Amortization of net losses	13	9	27	19
Curtailment loss (gain)	1		2
Net periodic benefit cost	39	37	79	74
Postretirement Benefit Plans [Member]
Components of net periodic benefit cost:
Service cost	2	2	3	3
Interest cost	2	3	5	6
Expected return on plan assets		(1)	(1)	(1)
Amortization of prior service costs (credits)	(1)	(1)	(2)	(2)
Amortization of net losses	1		1
Curtailment loss (gain)	(1)	(2)		(2)
Net periodic benefit cost	$ 3	$ 1	$ 6	$ 4