Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Net sales	$ 5,862	$ 5,341
Cost of sales	3,971	3,613
Gross profit	1,891	1,728
Selling, general and administrative expenses	(1,369)	(1,294)
Restructuring and impairment costs	(49)	0
Net financing charges	(53)	(59)
Equity income	70	58
Income from continuing operations before income taxes	490	433
Income tax provision	71	61
Income from continuing operations	419	372
Income from discontinued operations, net of tax (Note 4)	0	124
Net income	419	496
Income from continuing operations attributable to noncontrolling interests	38	45
Net income attributable to Johnson Controls	381	451
Amounts attributable to Johnson Controls ordinary shareholders
Income from continuing operations	381	327
Income from discontinued operations	$ 0	$ 124
Earnings per share
Basic earnings per share from continuing operations	$ 0.54	$ 0.45
Basic earnings per share from discontinued operations	0	0.17
Basic earnings per share	0.54	0.62
Diluted earnings per share from continuing operations	0.54	0.45
Diluted earnings per share from discontinued operations	0	0.17
Diluted earnings per share	$ 0.54	$ 0.62
Products and Systems [Member]
Net sales	$ 4,420	$ 3,799
Cost of sales	3,153	2,719
Services [Member]
Net sales	1,442	1,542
Cost of sales	$ 818	$ 894