Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Net sales	$ 23,668	$ 22,317	$ 23,968
Cost of sales	15,609	14,906	16,275
Gross profit	8,059	7,411	7,693
Selling, general and administrative expenses	(5,258)	(5,665)	(6,244)
Restructuring and impairment costs	(242)	(783)	(235)
Net financing charges	(206)	(231)	(350)
Equity income	261	171	192
Income from continuing operations before income taxes	2,614	903	1,056
Income tax provision (benefit)	868	108	(233)
Income from continuing operations	1,746	795	1,289
Income from discontinued operations, net of tax (Note 3)	124	0	4,598
Net income	1,870	795	5,887
Income from continuing operations attributable to noncontrolling interests	233	164	189
Income from discontinued operations attributable to noncontrolling interests	0	0	24
Net income attributable to Johnson Controls	1,637	631	5,674
Amounts attributable to Johnson Controls, Inc. common shareholders
Income from continuing operations	1,513	631	1,100
Income from discontinued operations	$ 124	$ 0	$ 4,574
Earnings per share
Basic earnings per share from continuing operations	$ 2.11	$ 0.84	$ 1.26
Basic earnings per share from discontinued operations	0.17	0	5.26
Basic earnings per share	2.28	0.84	6.52
Diluted earnings per share from continuing operations	2.10	0.84	1.26
Diluted earnings per share from discontinued operations	0.17	0	5.23
Diluted earnings per share	$ 2.27	$ 0.84	$ 6.49
Products and Systems [Member]
Net sales	$ 17,202	$ 16,253	$ 17,711
Cost of sales	11,848	11,401	12,577
Services [Member]
Net sales	6,466	6,064	6,257
Cost of sales	$ 3,761	$ 3,505	$ 3,698