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Merger Transaction Fair Value of Consideration Transferred (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
Sep. 02, 2016
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Sep. 30, 2018
$ / shares
Sep. 30, 2017
$ / shares
Tyco share consolidation ratio 0.955 0.955    
Ordinary shares, par value | $ / shares $ 1.00   $ 0.01 $ 0.01
Business Combination, Consideration Transferred per Share For Share Election | $ / shares $ 5.7293      
Business Combination, Consideration Transferred, Shares, For Share Election | shares 0.8357      
Business Combination, Consideration Transferred per Share | $ / shares $ 34.88 $ 34.88    
Cash consideration paid to JCI Inc. shareholders | $ $ 3,864 $ 3,864    
Percent Ownership by Shareholders of Acquiror Subsequent to Acquisition 56.00%      
Percent Ownership by Shareholders of Acquiree Subsequent to Acquisition 44.00%      
Total fair value of consideration transferred | $ $ 19,671 $ 19,700    
Fair value of Tyco equity awards | $ 224      
Fair Value of Acquiree Equity Awards not Earned as of Merger Date | $ $ 101      
Number of Tyco shares outstanding at September 2, 2016 | shares 427,181,743 427,200,000    
Tyco ordinary shares outstanding following the share consolidation and immediately prior to the Merger | shares 407,958,565 408,000,000    
JCI Inc. converted share price (1) | $ / shares $ 47.67      
Fair value of equity portion of the Merger consideration | $ $ 19,447      
Acquiror Closing Share Price | $ / shares $ 45.45      
JCI Inc. market capitalization at Merger date | $ $ 29,012      
Reduction in shares due to cash consideration paid by Tyco | shares 110,800,000 (110,800,000)    
Tyco merger [Member]        
Ordinary shares, par value | $ / shares $ 1.00