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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Earnings Per Share [Abstract]
Net income attributable to Johnson Controls	$ 374	$ 118
Weighted Average Shares Outstanding
Basic weighted average shares outstanding (in shares)	680.7	687.0
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards (in shares)	1.7	3.3
Diluted weighted average shares outstanding (in shares)	682.4	690.3
Antidilutive Securities
Stock options and unvested restricted stock (in shares)	0.6	0.3

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