Pension & Postretirement Plans (Schedule Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 19	$ 21	$ 57	$ 63
Interest cost	34	32	102	96
Expected return on plan assets	(78)	(84)	(234)	(252)
Net amortization	23	35	69	105
Total	$ (2)	$ 4	$ (6)	$ 12