Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (469)	$ 557	$ 21	$ 1,103
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	203	(504)	26	(855)
Realized and unrealized gains (losses) on derivatives	5	7	2	(3)
Pension and postretirement plans	0	0	0	(3)
Other comprehensive income (loss)	208	(497)	28	(861)
Total comprehensive income (loss)	(261)	60	49	242
Comprehensive income attributable to noncontrolling interests	90	6	111	45
Comprehensive income (loss) attributable to Johnson Controls, Inc.	$ (351)	$ 54	$ (62)	$ 197