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Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Additional Information) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Dec. 31, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
May 01, 2019
Mar. 31, 2019
Equity, Class of Treasury Stock [Line Items]                
Business Combination, Consideration Transferred       $ 32        
Stock repurchase program, authorized amount       1,000       $ 8,500
Common Stock, Value, Issued       $ 8 $ 10      
Cash dividends ordinary, per share       $ 1.04 $ 1.04 $ 1.00    
Spin-off of Adient           $ (4,038)    
Repurchases of ordinary shares         $ 300 651    
Document Period End Date       Sep. 30, 2019        
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 4,600        
Share tender offer to purchase up to $4.0 billion of ordinary shares             $ 4,000  
Share tender offer, price per share $ 39.25              
Share Tender Offer, Accepted Shares 102              
Ordinary shares, par value       $ 0.01 $ 0.01      
Stock Repurchased and Retired During Period Value Open Market       $ 1,948        
Stock Repurchased and Retired During Period Value Tender Offer       4,035        
Parent                
Equity, Class of Treasury Stock [Line Items]                
Accounting Pronouncement         $ 179      
Spin-off of Adient     $ 4,000     (4,038)    
Repurchases of ordinary shares       (5,983) $ (300) $ (651)    
Minimum                
Equity, Class of Treasury Stock [Line Items]                
Share tender offer, price per share $ 36.00              
Maximum                
Equity, Class of Treasury Stock [Line Items]                
Share tender offer, price per share $ 40.00              
Accounting Standards Update 2014-09 [Member]                
Equity, Class of Treasury Stock [Line Items]                
Accounting Pronouncement       (45)        
Accounting Standards Update 2014-09 [Member] | Parent                
Equity, Class of Treasury Stock [Line Items]                
Accounting Pronouncement   $ (45)   (45)        
Accounting Standards Update 2016-16 [Member]                
Equity, Class of Treasury Stock [Line Items]                
Accounting Pronouncement       (546)        
Accounting Standards Update 2016-16 [Member] | Parent                
Equity, Class of Treasury Stock [Line Items]                
Accounting Pronouncement   $ (546)   $ (546)