Pension & Postretirement Plans (Schedule Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12	$ 19	$ 24	$ 38
Interest cost	54	34	108	68
Expected return on plan assets	(71)	(78)	(142)	(156)
Net amortization	(20)	23	(40)	46
Total	$ (25)	$ (2)	$ (50)	$ (4)