Pension And Postretirement Plan Expenses (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pensions [Member]
Service cost	$ 21	$ 18	$ 62	$ 56
Interest cost	55	55	166	166
Expected return on plan assets	(82)	(76)	(246)	(229)
Net amortization	42	35	127	104
Total	36	32	109	97
Postretirement Plans [Member]
Service cost	1	1	3	3
Interest cost	4	6	13	18
Net amortization	(2)	0	(6)	1
Total	$ 3	$ 7	$ 10	$ 22