Pension & Postretirement Expenses (Schedule Of Net Periodic Pension And Net Postretirement Plan Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 21	$ 22
Interest cost	32	40
Expected return on plan assets	(84)	(84)
Net amortization	35	37
Total	$ 4	$ 15