Income Taxes - Components of Deferred Income Taxes (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Components Of Deferred Tax Assets [Abstract]
Deferred expenses	$ 38	$ 37
Intangible assets	32
Inventory	9	11
Other	3	20
Pension and other benefits	72	74
Net operating loss carry-forwards	145	171
Foreign tax credit carry-forwards	42	40
R&D credit carry-forwards	31	28
Other business credit carry-forwards	40	38
Subtotal	412	419
Valuation allowances	(161)	(186)
Total deferred tax assets	251	233
Intangible assets		(37)
Property, plant and equipment	(116)	(143)
Total deferred tax liabilities	$ (116)	$ (180)