Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	$ 369	$ 357
Less accumulated depreciation	(166)	(137)
Net Property, Plant and Equipment	203	220
Land
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	11	15
Buildings and Improvements
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	90	98
Furniture and Fixtures
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	10	10
Computer Hardware and Software
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	232	203
Construction in Progress
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	15	20
Machinery and Equipment
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	$ 11	$ 11