Income Taxes (Schedule Of Principal Components Of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Income Tax Disclosure [Abstract]
Current: U.S. Federal	$ 341	$ 351	$ 394
Current: State and local	52	40	11
Current: Non-U.S.	300	311	305
Deferred: U.S. Federal	(224)	7	2
Deferred: State and local	(11)	4	4
Deferred: Non-U.S.	(15)	(53)	(19)
Income tax expense	$ 443	$ 660	$ 697