Income Taxes (Schedule Of Principal Components Of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Current: Federal	$ 351	$ 394	$ 831
Current: State and local	40	11	86
Current: Non-U.S.	311	305	398
Deferred: Federal	7	2	12
Deferred: State and local	4	4	(1)
Deferred: Non-U.S.	(53)	(19)	(59)
Income tax expense	$ 660	$ 697	$ 1,267