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Equity and Noncontrolling Interests Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Mar. 31, 2019
Equity [Line Items]              
Deferred tax asset from stock options exercised and restricted stock vestings   $ 179          
Stock repurchase program, authorized amount       $ 1,000     $ 8,500
Payments for Repurchase of Common Stock       5,983 $ 300 $ 651  
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning balance $ 21,164 20,447 $ 24,118 21,164 20,447 24,118  
Beginning balance 1,294     1,294      
Beginning balance 22,458     22,458      
Net income       5,674 2,162 1,611  
Foreign currency translation adjustments       (342) (483) 103  
Realized and unrealized gains (losses) on derivatives       6 (29) (14)  
Realized and unrealized gains on marketable securities       0 4 5  
Pension and postretirement plans       (6) 0 0  
Other comprehensive income (loss)       (342) (508) 94  
Comprehensive income attributable to Johnson Controls       5,350 1,689 1,710  
Comprehensive income attributable to noncontrolling interest       195 186 203  
Total comprehensive income       5,545 1,875 1,913  
Cash dividends - ordinary shares       (887) (968) (938)  
Repurchases of ordinary shares         300 651  
Spin-off of Adient           4,038  
Other, including options exercised       (230) (117) (246)  
Ending balance       19,766 21,164 20,447  
Ending balance       1,063 1,294    
Ending balance       20,829 22,458    
Parent              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning balance 21,164 20,447 24,118 21,164 20,447 24,118  
Net income       5,674 2,162 1,611  
Foreign currency translation adjustments       (325) (458) 108  
Realized and unrealized gains (losses) on derivatives       7 (19) (14)  
Realized and unrealized gains on marketable securities         4 5  
Pension and postretirement plans       (6)      
Other comprehensive income (loss)       (324) (473) 99  
Comprehensive income attributable to Johnson Controls       5,350 1,689 1,710  
Cash dividends - ordinary shares       (887) (968) (938)  
Dividends attributable to noncontrolling interests       0 0 0  
Repurchases of ordinary shares       (5,983) (300) (651)  
Accounting Pronouncement         179    
Change in noncontrolling interest share         0 0  
Noncontrolling Interest, Change in Redemption Value         0    
Spin-off of Adient     (4,000)     4,038  
Other, including options exercised       230 117 246  
Ending balance       19,766 21,164 20,447  
Nonredeemable Noncontrolling Interest              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning balance 1,294 920 972 1,294 920 972  
Net income       213 186 164  
Foreign currency translation adjustments       (17) (22) (18)  
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax, Noncontrolling Interest       (1) (1) 1  
Realized and unrealized gains on marketable securities         0 0  
Pension and postretirement plans       0      
Other comprehensive income (loss)       (18) (23) (17)  
Comprehensive income attributable to noncontrolling interest       195 163 147  
Cash dividends - ordinary shares       0 0 0  
Dividends attributable to noncontrolling interests       (132) (43) (56)  
Repurchases of ordinary shares       0 0 0  
Accounting Pronouncement         0    
Change in noncontrolling interest share         23 (5)  
Noncontrolling Interest, Change in Redemption Value         231    
Spin-off of Adient           138  
Other, including options exercised       1 0 0  
Ending balance       1,063 1,294 920  
Stockholders' Equity, Total              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Beginning balance 22,458 $ 21,367 $ 25,090 22,458 21,367 25,090  
Net Income       5,887 2,348 1,775  
Foreign currency translation adjustments       (342) (480) 90  
Realized and unrealized gains (losses) on derivatives       6 (20) (13)  
Realized and unrealized gains on marketable securities         4 5  
Pension and postretirement plans       (6)      
Other comprehensive income (loss)       (342) (496) 82  
Total comprehensive income       5,545 1,852 1,857  
Cash dividends - ordinary shares       (887) (968) (938)  
Dividends attributable to noncontrolling interests       (132) (43) (56)  
Repurchases of ordinary shares       (5,983) (300) (651)  
Accounting Pronouncement         179    
Change in noncontrolling interest share         23 (5)  
Noncontrolling Interest, Change in Redemption Value         231    
Spin-off of Adient           4,176  
Other, including options exercised       231 117 246  
Ending balance       20,829 22,458 21,367  
Power Solutions              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Realized and unrealized gains (losses) on derivatives       4 $ 0 $ 0  
Divestiture of Power Solutions       (483)      
Power Solutions | Parent              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Divestiture of Power Solutions       483      
Power Solutions | Nonredeemable Noncontrolling Interest              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Divestiture of Power Solutions       (295)      
Power Solutions | Stockholders' Equity, Total              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Divestiture of Power Solutions       188      
Accounting Standards Update 2014-09 [Member]              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement       (45)      
Accounting Standards Update 2014-09 [Member] | Parent              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement (45)     (45)      
Accounting Standards Update 2014-09 [Member] | Nonredeemable Noncontrolling Interest              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement       0      
Accounting Standards Update 2014-09 [Member] | Stockholders' Equity, Total              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement       (45)      
Accounting Standards Update 2016-16 [Member]              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement       (546)      
Accounting Standards Update 2016-16 [Member] | Parent              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement $ (546)     (546)      
Accounting Standards Update 2016-16 [Member] | Nonredeemable Noncontrolling Interest              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement       0      
Accounting Standards Update 2016-16 [Member] | Stockholders' Equity, Total              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Accounting Pronouncement       $ (546)