Property, Plant and Equipment - Details of Property, Plant and Equipment, Net (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 4,720	$ 4,514
Less: accumulated depreciation	(3,311)	(3,104)
Property, plant and equipment - net	1,409	1,410
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,068	1,031
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	3,399	3,245
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	172	152
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 81	$ 86