Consolidated Statements of Shareholders' Equity Attributable to Johnson Controls Ordinary Shareholders Consolidated Statements of Shareholders' Equity Attributable to Johnson Controls Ordinary Shareholders (Parenthetical) - $ / shares	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Dividend declared	$ 0.26	$ 0.26	$ 0.52	$ 0.52
Retained Earnings
Dividend declared	$ 0.26	$ 0.26	$ 0.52	$ 0.52