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, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 19	$ 21	$ 38	$ 42
Interest cost	34	32	68	64
Expected return on plan assets	(78)	(84)	(156)	(168)
Net amortization	23	35	46	70
Total	$ (2)	$ 4	$ (4)	$ 8