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Acquisitions and Divestitures Acquisitions (Details)
$ in Millions
12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Acquisitions      
Payments for (Proceeds from) Previous Acquisition $ 0 $ 0 $ 75
Business Combination, Consideration Transferred 32    
Payments to acquire businesses, net of cash acquired 25 21 $ 6
Goodwill, acquired during period 25 15  
Business Acquisitions, Not Specified      
Business Acquisitions      
Number of Businesses Acquired     3
Business Combination, Consideration Transferred   21 $ 9
Payments to acquire businesses, net of cash acquired 25   6
Goodwill, acquired during period     $ 2
Global Products | Business Acquisitions, Not Specified      
Business Acquisitions      
Goodwill, acquired during period 11 14  
Building Solutions Asia Pacific | Business Acquisitions, Not Specified      
Business Acquisitions      
Goodwill, acquired during period 8    
Building Solutions EMEA/LA | Business Acquisitions, Not Specified      
Business Acquisitions      
Goodwill, acquired during period $ 6 $ 1