Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Property, Plant and Equipment [Abstract]
Buildings and improvements	$ 1,095	$ 1,033
Subscriber systems	989	973
Machinery and equipment	3,597	3,374
Construction in progress	382	418
Land	47	48
Total property, plant and equipment	6,110	5,846
Less: Accumulated depreciation	(3,917)	(3,443)
Property, plant and equipment - net	$ 2,193	$ 2,403	$ 2,374