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Property, Plant and Equipment Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Abstract]      
Buildings and improvements $ 1,499 $ 1,213  
Subscriber systems 661 573  
Machinery and equipment 2,969 2,715  
Construction in progress 465 704  
Land 250 258  
Total property, plant and equipment 5,844 5,463  
Less accumulated depreciation (2,496) (2,163)  
Property, plant and equipment - net $ 3,348 $ 3,300 $ 3,341