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Earnings Per Share (Details) - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Income Available to Ordinary Shareholders      
Income from continuing operations $ 1,407 $ 1,562 $ 1,279
Income from discontinued operations, net of tax 298 287 253
Net income attributable to Johnson Controls $ 1,705 $ 1,849 $ 1,532
Weighted Average Shares Outstanding      
Basic weighted average shares outstanding (in shares) 673.8 684.3 696.1
Effect of dilutive securities:      
Stock options, unvested restricted stock and unvested performance share awards (in shares) 2.2 3.1 3.5
Diluted weighted average shares outstanding (in shares) 676.0 687.4 699.6
Antidilutive Securities      
Stock options and unvested restricted stock (in shares) 0.3 0.2 0.4