Consolidated Statements of Income - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Net sales	$ 22,317	$ 23,968	$ 23,400
Cost of sales	14,906	16,275	15,733
Gross profit	7,411	7,693	7,667
Selling, general and administrative expenses	(5,665)	(6,244)	(5,642)
Restructuring and impairment costs	(783)	(235)	(255)
Net financing charges	(231)	(350)	(401)
Equity income	171	192	177
Income from continuing operations before income taxes	903	1,056	1,546
Income tax provision (benefit)	108	(233)	197
Income from continuing operations	795	1,289	1,349
Income from discontinued operations, net of tax (Note 3)	0	4,598	1,034
Net income	795	5,887	2,383
Income from continuing operations attributable to noncontrolling interests	164	189	174
Income from discontinued operations attributable to noncontrolling interests	0	24	47
Net income attributable to Johnson Controls	631	5,674	2,162
Amounts attributable to Johnson Controls, Inc. common shareholders
Income from continuing operations	631	1,100	1,175
Income from discontinued operations	$ 0	$ 4,574	$ 987
Earnings per share
Basic earnings per share from continuing operations	$ 0.84	$ 1.26	$ 1.27
Basic earnings per share from discontinued operations	0	5.26	1.07
Basic earnings per share	0.84	6.52	2.34
Diluted earnings per share from continuing operations	0.84	1.26	1.26
Diluted earnings per share from discontinued operations	0	5.23	1.06
Diluted earnings per share	$ 0.84	$ 6.49	$ 2.32
Products and Systems [Member]
Net sales	$ 16,253	$ 17,711	$ 17,332
Cost of sales	11,401	12,577	12,315
Services [Member]
Net sales	6,064	6,257	6,068
Cost of sales	$ 3,505	$ 3,698	$ 3,418