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	$ 3,278	$ 3,091
Machinery and equipment	9,119	8,566
Construction in progress	1,356	1,006
Land	481	338
Total property, plant and equipment	14,234	13,001
Less accumulated depreciation	(7,585)	(7,131)
Property, plant and equipment - net	$ 6,649	$ 5,870	$ 6,314