Property, Plant and Equipment Schedule of Property, Plant and Equipment (Details) - USD ($) $ in Millions	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Abstract]
Buildings and improvements	$ 3,435	$ 3,091
Subscriber systems, Gross	448	0
Machinery and equipment	9,626	8,566
Construction in progress	1,441	1,006
Land	526	338
Total property, plant and equipment	15,476	13,001
Less accumulated depreciation	(7,604)	(7,131)
Property, plant and equipment - net	$ 7,872	$ 5,870	$ 6,314