Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	$ 1,142	$ 1,096
Less: Accumulated depreciation	(701)	(615)
Net Property, Plant and Equipment	441	481
Land
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	10	11
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	190	216
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	47	45
Computer hardware and software
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	788	650
Construction in progress
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	89	132
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross Property, Plant and Equipment	$ 18	$ 42