Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Net sales	$ 5,341	$ 5,576
Cost of sales	3,613	3,773
Gross profit	1,728	1,803
Selling, general and administrative expenses	(1,294)	(1,427)
Restructuring and impairment costs	0	(111)
Net financing charges	(59)	(52)
Equity income	58	43
Income from continuing operations before income taxes	433	256
Income tax provision	61	65
Income from continuing operations	372	191
Income from discontinued operations, net of tax (Note 4)	124	0
Net income	496	191
Income from continuing operations attributable to noncontrolling interests	45	32
Net income attributable to Johnson Controls	451	159
Amounts attributable to Johnson Controls ordinary shareholders
Income from continuing operations	327	159
Income from discontinued operations	$ 124	$ 0
Earnings per share
Basic earnings per share from continuing operations	$ 0.45	$ 0.21
Basic earnings per share from discontinued operations	0.17	0
Basic earnings per share	0.62	0.21
Diluted earnings per share from continuing operations	0.45	0.21
Diluted earnings per share from discontinued operations	0.17	0
Diluted earnings per share	$ 0.62	$ 0.21
Products and Systems [Member]
Net sales	$ 3,799	$ 4,036
Cost of sales	2,719	2,866
Services [Member]
Net sales	1,542	1,540
Cost of sales	$ 894	$ 907