Consolidated Statements of Comprehensive Income (Loss) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 1,335	$ 1,292	$ 1,310
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(642)	(20)	(222)
Realized and unrealized gains (losses) on derivatives	(3)	(5)	39
Realized and unrealized gains (losses) on marketable common stock	(7)	2	(1)
Pension and postretirement plans	5	16	8
Other comprehensive loss	(657)	(39)	(192)
Total Comprehensive income	678	1,253	1,118
Comprehensive income attributable to noncontrolling interests	118	115	125
Comprehensive income attributable to Johnson Controls, Inc.	$ 560	$ 1,138	$ 993