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Property, Plant and Equipment (Tables)
 12 Months Ended
Sep. 30, 2020
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, plant and equipment consisted of the following (in millions):
 September 30,
 20202019
Buildings and improvements$1,351 $1,499 
Subscriber systems679 661 
Machinery and equipment3,332 2,969 
Construction in progress327 465 
Land241 250 
Total property, plant and equipment5,930 5,844 
Less: accumulated depreciation(2,871)(2,496)
Property, plant and equipment - net$3,059 $3,348