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Earnings Per Share (Tables)
6 Months Ended
Mar. 31, 2024
Earnings Per Share [Abstract]  
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