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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Available to Ordinary Shareholders
Income from continuing operations	$ 1,849	$ 1,532	$ 1,513
Income from discontinued operations	0	0	124
Net income attributable to Johnson Controls	$ 1,849	$ 1,532	$ 1,637
Weighted Average Shares Outstanding
Basic weighted average shares outstanding (in shares)	684.3	696.1	716.6
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards (in shares)	3.1	3.5	4.5
Diluted weighted average shares outstanding (in shares)	687.4	699.6	721.1
Antidilutive Securities
Stock options and unvested restricted stock (in shares)	0.2	0.4	0.0

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