Income Taxes (Schedule Of Principal Components Of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Current: U.S. Federal	$ 123	$ 247	$ 341
Current: State and local	15	24	52
Current: Non-U.S.	288	308	300
Deferred: U.S. Federal	(44)	(2)	(224)
Deferred: State and local	1	12	(11)
Deferred: Non-U.S.	(38)	(58)	(15)
Income tax expense	$ 345	$ 531	$ 443