Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 5,966	$ 6,049
Less: accumulated depreciation	(4,359)	(4,468)
Property, plant and equipment - net	1,607	1,581
Buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	1,228	1,224
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	4,476	4,462
Construction in progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	162	256
Land
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 100	$ 107