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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Income Available to Ordinary Shareholders
Income from continuing operations	$ 1,532	$ 1,513	$ 631
Income from discontinued operations	0	124	0
Net income attributable to Johnson Controls	$ 1,532	$ 1,637	$ 631
Weighted Average Shares Outstanding
Basic weighted average shares outstanding (in shares)	696.1	716.6	751.0
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards (in shares)	3.5	4.5	2.6
Diluted weighted average shares outstanding (in shares)	699.6	721.1	753.6
Antidilutive Securities
Stock options and unvested restricted stock (in shares)	0.4	0.0	1.4

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