Consolidated Statements of Income - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Net sales		$ 5,576	$ 5,464
Cost of sales		3,773	3,739
Gross profit		1,803	1,725
Selling, general and administrative expenses		(1,427)	(1,438)
Restructuring and impairment costs		(111)	0
Net financing charges		(52)	(85)
Equity income		43	42
Income from continuing operations before income taxes		256	244
Income tax provision		65	108
Income from continuing operations		191	136
Income from discontinued operations, net of tax (Note 4)		0	263
Net income		191	399
Income from continuing operations attributable to noncontrolling interests		32	29
Income from discontinued operations attributable to noncontrolling interests		0	15
Net income attributable to Johnson Controls		159	355
Amounts attributable to Johnson Controls ordinary shareholders
Income from continuing operations		159	107
Income from discontinued operations		$ 0	$ 248
Earnings per share
Basic earnings per share from continuing operations		$ 0.21	$ 0.12
Basic earnings per share from discontinued operations		0	0.27
Basic earnings per share		0.21	0.39
Diluted earnings per share from continuing operations		0.21	0.12
Diluted earnings per share from discontinued operations		0	0.27
Diluted earnings per share	[1]	$ 0.21	$ 0.38
Products and Systems [Member]
Net sales		$ 4,036	$ 3,922
Cost of sales		2,866	2,824
Services [Member]
Net sales		1,540	1,542
Cost of sales		$ 907	$ 915

[1] Certain items do not sum due to rounding.