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Earnings Per Share
 6 Months Ended
Mar. 31, 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
March 31,		Six Months Ended
March 31,
 2023202220232022
Net income attributable to Johnson Controls $133 $11 $251 $392 
Weighted Average Shares Outstanding
Basic weighted average shares outstanding686.8 699.1 686.9 701.8 
Effect of dilutive securities:
Stock options, unvested restricted stock and
     unvested performance share awards		2.9 3.6 3.1 4.4 
Diluted weighted average shares outstanding689.7 702.7 690.0 706.2 
Antidilutive Securities
Stock options and unvested restricted stock0.3 0.3 0.3 0.2