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Acquisitions and Divestitures Divestitures (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2019
Divestitures [Line Items]        
Business divestitures, net of cash divested $ 19 $ 135 $ 12  
Goodwill, written off related to divestiture 7 11    
Business Divestitures, Not Specific        
Divestitures [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration   152 18  
Business divestitures, net of cash divested   135 16  
Business Divestitures, Not Specific | Building Solutions Asia Pacific        
Divestitures [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration 27      
Business divestitures, net of cash divested 19      
Goodwill, written off related to divestiture $ 7 $ 11    
Business Divestitures, Not Specific | Building Solutions EMEA/LA        
Divestitures [Line Items]        
Goodwill, written off related to divestiture     1  
Power Solutions        
Divestitures [Line Items]        
Disposal Group, Including Discontinued Operation, Consideration     13,200  
Disposal Group, Discontinued Operations, Consideration, net     11,600 $ 11,600
Discontinued Operation, Gain from Disposal of Discontinued Operation, before Income Tax     5,200  
Discontinued Operation, Gain on Disposal of Discontinued Operation, Net of Tax     $ 4,000