Income Taxes - Components of Deferred Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Deferred expenses	$ 37	$ 29
Inventory	11
Other	20	28
Pension and other benefits	74	71
Net operating loss carry-forwards	171	187
Foreign tax credit carry-forwards	40	49
R&D credit carry-forwards	28	28
Other business credit carry-forwards	38	32
Subtotal	419	424
Valuation allowances	(186)	(166)
Total deferred tax assets	233	258
Intangible assets	(37)	(28)
Property, plant and equipment	(143)	(149)
Total deferred tax liabilities	$ (180)	$ (177)