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Earnings Per Share (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Earnings Per Share [Abstract]
Net income attributable to Johnson Controls	$ 975	$ 1,049	$ 1,072	$ 1,300
Weighted Average Shares Outstanding
Basic weighted average shares outstanding (in shares)	670.3	683.3	676.7	685.7
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards (in shares)	2.5	2.9	1.9	3.1
Diluted weighted average shares outstanding (in shares)	672.8	686.2	678.6	688.8
Antidilutive Securities
Stock options and unvested restricted stock (in shares)	0.1	0.2	0.4	0.3

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