Postretirement Benefit Plans (Net Pension Cost And Net Postretirement Benefit Cost) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 25, 2011	Sep. 26, 2010	Sep. 25, 2011	Sep. 26, 2010
Other Postretirement Plans, Defined Benefit [Member]
Service cost	$ 8	$ 9	$ 24	$ 27
Interest cost	41	42	122	124
Expected return on plan assets	(35)	(32)	(105)	(96)
Amortization of prior service cost	(4)	(4)	(12)	(12)
Recognized net actuarial losses	8	6	25	19
Total net expense	18	21	54	62
Pension Plans Defined Benefit [Member]
Service cost	244	226	731	677
Interest cost	479	469	1,438	1,407
Expected return on plan assets	(509)	(506)	(1,525)	(1,520)
Amortization of prior service cost	21	21	62	62
Recognized net actuarial losses	220	148	660	446
Total net expense	$ 455	$ 358	$ 1,366	$ 1,072