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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12	$ 19	$ 36	$ 57
Interest cost	54	34	162	102
Expected return on plan assets	(71)	(78)	(213)	(234)
Net amortization	(18)	23	(58)	69
Total	$ (23)	$ (2)	$ (73)	$ (6)