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Earnings Per Share
 9 Months Ended
Jun. 30, 2023
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share (in millions):
Three Months Ended
June 30,		Nine Months Ended
June 30,
 2023202220232022
Net income attributable to Johnson Controls $1,049 $379 $1,300 $771 
Weighted Average Shares Outstanding
Basic weighted average shares outstanding683.3 692.2 685.7 698.6 
Effect of dilutive securities:
Stock options, unvested restricted stock and
     unvested performance share awards		2.9 2.7 3.1 3.8 
Diluted weighted average shares outstanding686.2 694.9 688.8 702.4 
Antidilutive Securities
Stock options and unvested restricted stock0.2 0.6 0.3 0.3