Consolidated Statements of Shareholders' Equity Attributable to Johnson Controls Ordinary Shareholders - USD ($) $ in Millions	Total	Ordinary Shares	Capital in excess of par value	Retained Earnings	Treasury Stock, at Cost	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Sep. 30, 2014	$ 11,270	$ 7	$ 3,369	$ 9,915	$ (1,784)	$ (237)
Comprehensive income (loss) attributable to Johnson Controls	743	0	0	1,563	0	(820)
Cash dividends	(681)	0	0	(681)	0	0
Repurchases of common stock	(1,362)	0	0	0	(1,362)	0
Other, including options exercised	365	0	371	0	(6)	0
Ending balance at Sep. 30, 2015	10,335	7	3,740	10,797	(3,152)	(1,057)
Comprehensive income (loss) attributable to Johnson Controls	(964)	0	0	(868)	0	(96)
Result of contribution of Johnson Controls, Inc. to Johnson Controls International plc	15,808	2	12,157	0	3,649	0
Cash dividends	(752)	0	0	(752)	0	0
Repurchases of common stock	(501)	0	0	0	(501)	0
Other, including options exercised	192	0	208	0	(16)	0
Ending balance at Sep. 30, 2016	24,118	9	16,105	9,177	(20)	(1,153)
Comprehensive income (loss) attributable to Johnson Controls	1,710	0	0	1,611	0	99
Result of contribution of Johnson Controls, Inc. to Johnson Controls International plc	15,800
Cash dividends	(938)	0	0	(938)	0	0
Repurchases of common stock	(651)	0	0	0	(651)	0
Stockholder's equity, spin-off of Adient	(4,038)	0	0	(4,619)	0	581
Other, including options exercised	246	0	285	0	(39)	0
Ending balance at Sep. 30, 2017	$ 20,447	$ 9	$ 16,390	$ 5,231	$ (710)	$ (473)