Income Taxes - Provision for Income Taxes from Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Federal	$ 50	$ 225	$ 177
State and local, including Puerto Rico	15	(11)	(4)
Foreign	252	217	179
Total, Current	318	431	352
Domestic	(238)	(59)	(119)
Foreign	(37)	(35)	3
Total, Deferred	(274)	(94)	(116)
Total	$ 44	$ 337	$ 236