Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 6,192	$ 6,215
Less: accumulated depreciation	(4,521)	(4,532)
Property, plant and equipment - net	1,671	1,683
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,183	1,277
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	4,612	4,501
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	262	298
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 135	$ 139