Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 207	$ 199	$ 1,310	$ 997
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	147	18	(708)	0
Realized and unrealized gains (losses) on derivatives	(1)	1	(4)	(3)
Realized and unrealized losses on marketable common stock	0	0	0	(7)
Pension and postretirement plans	0	0	(3)	(2)
Other comprehensive income (loss)	146	19	(715)	(12)
Total comprehensive income	353	218	595	985
Comprehensive income attributable to noncontrolling interests	34	23	79	91
Comprehensive income attributable to Johnson Controls, Inc.	$ 319	$ 195	$ 516	$ 894