Income Taxes (Schedule Of Principal Components Of Income Tax Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Current: Federal	$ 394	$ 831	$ 623
Current: State and local	11	86	47
Current: Non-U.S.	305	398	416
Deferred: Federal	2	12	(132)
Deferred: State and local	4	(1)	(7)
Deferred: Non-U.S.	(19)	(59)	6
Income tax expense	$ 697	$ 1,267	$ 953