Financial Information by Segment & Geographic Area - Schedule of Income (Loss) from Continuing Operations before Taxes for Unallocated and Other (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Interest expense	$ (53)	$ (55)	$ (62)
Unallocated and Other [Member]
Segment Reporting Information [Line Items]
Interest expense	(53)	(55)	(62)
Total certain items, pre-tax	(617)	(28)	(54)
Equity in earnings of affiliated companies, net of tax	(4)		(11)
Unallocated corporate costs	(46)	(54)	(48)
General unallocated expense	11	(2)	(1)
Income from continuing operations before income taxes and equity in earnings of affiliated companies	$ (709)	$ (139)	$ (176)