Pension & Postretirement Plans (Schedule Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 19	$ 21
Interest cost	34	32
Expected return on plan assets	(78)	(84)
Net amortization	23	35
Total	$ (2)	$ 4