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Earnings Per Share
6 Months Ended
Mar. 31, 2024
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
March 31,
Six Months Ended
March 31,
 2024202320242023
Net income (loss) attributable to Johnson Controls $(277)$133 $97 $251 
Weighted Average Shares Outstanding
Basic weighted average shares outstanding679.0 686.8 679.9 686.9 
Effect of dilutive securities:
Stock options, unvested restricted stock and
     unvested performance share awards
— 2.9 1.6 3.1 
Diluted weighted average shares outstanding679.0 689.7 681.5 690.0 
Antidilutive Securities
Stock options and unvested restricted stock— 0.3 0.5 0.3 

For the three months ended March 31, 2024, the total number of potential dilutive shares due to stock options, unvested restricted stock and unvested performance share awards was 1.6 million. However, these items were not included in the computation of diluted loss per share for the three months ended March 31, 2024 since to do so would decrease the loss per share.