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Goodwill and Other Intangible Assets Goodwill Additional Information (Details) - USD ($)
12 Months Ended
Sep. 02, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Goodwill [Line Items]        
Goodwill, acquired during period   $ (256,000,000) $ 16,622,000,000  
Goodwill, written off related to divestiture   1,269,000,000 19,000,000  
Goodwill   19,688,000,000 21,024,000,000 $ 4,460,000,000
Building Technologies & Solutions | Global Products        
Goodwill [Line Items]        
Goodwill, acquired during period   (58,000,000) 5,038,000,000  
Goodwill, written off related to divestiture   1,267,000,000 (16,000,000)  
Goodwill   5,687,000,000 6,963,000,000 1,943,000,000
Building Technologies & Solutions | Building Solutions EMEA/LA        
Goodwill [Line Items]        
Goodwill, acquired during period   (37,000,000) 1,787,000,000  
Goodwill, written off related to divestiture   0 0  
Goodwill impairment loss       47,000,000
Goodwill   2,012,000,000 1,981,000,000 $ 195,000,000
Latin America [Member] | Building Solutions EMEA/LA        
Goodwill [Line Items]        
Goodwill   0 $ 0  
Tyco Merger [Member]        
Goodwill [Line Items]        
Goodwill, acquired during period $ 16,105,000,000 16,105,000,000    
Scott Safety business [Member] | Building Technologies & Solutions | Global Products        
Goodwill [Line Items]        
Sales Price of Business Divestitures   $ 1,248,000,000