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Equity and Noncontrolling Interests - Equity Attributable to Johnson Controls and Noncontrolling Interests (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Oct. 01, 2020
Oct. 01, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance $ 17,698 $ 18,084 $ 17,447 $ 19,766    
Beginning balance     1,086      
Beginning balance     18,533      
Net income (loss) attributable to Johnson Controls 574 (182) 1,368 190    
Foreign currency translation adjustments 75 72 435 (148)    
Foreign currency translation adjustments 89 76 460 (157)    
Realized and unrealized gains (losses) on derivatives (18) 6 (9) 3    
Pension and postretirement plans (1) 0 (2) (1)    
Other comprehensive income (loss) 70 82 449 (155)    
Comprehensive income (loss) attributable to Johnson Controls 633 (104) 1,793 42    
Comprehensive income attributable to noncontrolling interests 98 64 210 108    
Total comprehensive income (loss) 731 (40) 2,003 150    
Cash dividends - ordinary shares (193) (195) (577) (590)    
Repurchases and retirements of ordinary shares (340)   (1,001) (1,467)    
Other, including options exercised 42 20 190 59    
Change in noncontrolling interest share     (8)      
Adoption of ASU 17,840 17,805 17,840 17,805    
Adoption of ASU 1,157   1,157      
Adoption of ASU 18,997   18,997      
Ending balance 17,840 17,805 17,840 17,805    
Ending balance 1,157   1,157      
Ending balance 18,997   18,997      
Adoption of ASC 842 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance       (5)    
Adoption of ASU            
Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance     (4)      
Adoption of ASU            
Equity Attributable to Johnson Controls            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 17,698 18,084 17,447 19,766    
Net income (loss) attributable to Johnson Controls 574 (182) 1,368 190    
Foreign currency translation adjustments 75 72 435 (148)    
Realized and unrealized gains (losses) on derivatives (15) 6 (8) 1    
Pension and postretirement plans (1) 0 (2) (1)    
Other comprehensive income (loss) 59 78 425 (148)    
Comprehensive income (loss) attributable to Johnson Controls 633 (104) 1,793 42    
Cash dividends - ordinary shares (193) (195) (577) (590)    
Dividends attributable to noncontrolling interests     0 0    
Repurchases and retirements of ordinary shares (340) 0 (1,001) (1,467)    
Other, including options exercised 42 20 190 59    
Change in noncontrolling interest share     (8) 0    
Adoption of ASU 17,840 17,805 17,840 17,805    
Ending balance 17,840 17,805 17,840 17,805    
Equity Attributable to Johnson Controls | Adoption of ASC 842 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of ASU           $ (5)
Equity Attributable to Johnson Controls | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of ASU         $ (4)  
Equity Attributable to Noncontrolling Interest            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 1,059 1,004 1,086 1,063    
Income attributable to noncontrolling interests 87 60 186 115    
Foreign currency translation adjustments 14 4 25 (9)    
Realized and unrealized gains on derivatives (3) 0 (1) 2    
Pension and postretirement plans 0 0 0 0    
Other comprehensive income (loss) 11 4 24 (7)    
Comprehensive income attributable to noncontrolling interests 98 64 210 108    
Cash dividends - ordinary shares 0 0 0 0    
Dividends attributable to noncontrolling interests     (133) (103)    
Repurchases and retirements of ordinary shares 0 0 0 0    
Other, including options exercised 0 0 0 0    
Change in noncontrolling interest share     (6) 0    
Adoption of ASU 1,157 1,068 1,157 1,068    
Ending balance 1,157 1,068 1,157 1,068    
Equity Attributable to Noncontrolling Interest | Adoption of ASC 842 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance   0        
Adoption of ASU            
Equity Attributable to Noncontrolling Interest | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 0          
Adoption of ASU            
Total Equity [Member]            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Beginning balance 18,757 19,088 18,533 20,829    
Net income 661 (122) 1,554 305    
Foreign currency translation adjustments 89 76 460 (157)    
Realized and unrealized gains (losses) on derivatives (18) 6 (9) 3    
Pension and postretirement plans (1) 0 (2) (1)    
Other comprehensive income (loss) 70 82 449 (155)    
Total comprehensive income (loss) 731 (40) 2,003 150    
Cash dividends - ordinary shares (193) (195) (577) (590)    
Dividends attributable to noncontrolling interests     (133) (103)    
Repurchases and retirements of ordinary shares (340) 0 (1,001) (1,467)    
Other, including options exercised 42 20 190 59    
Change in noncontrolling interest share     (14) 0    
Adoption of ASU 18,997 18,873 18,997 18,873    
Ending balance $ 18,997 $ 18,873 $ 18,997 $ 18,873    
Total Equity [Member] | Adoption of ASC 842 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of ASU           $ (5)
Total Equity [Member] | Accounting Standards Update 2016-13 | Cumulative Effect, Period of Adoption, Adjustment            
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adoption of ASU         $ (4)