Property, Plant and Equipment Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Property, Plant and Equipment [Abstract]
Buildings and improvements	$ 1,313	$ 1,351
Subscriber systems	802	679
Machinery and equipment	3,669	3,332
Construction in progress	500	327
Land	231	241
Total property, plant and equipment	6,515	5,930
Less accumulated depreciation	(3,287)	(2,871)
Property, plant and equipment - net	$ 3,228	$ 3,059	$ 3,348