CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 65	$ 254	$ (20)
Other comprehensive income (loss):
Foreign currency translation adjustments	(97)	(20)	(32)
Pension and other postretirement benefit related adjustments (net of tax of $5, $2 and $12 at September 30, 2015, 2014 and 2013, respectively)	84	3	218
Unrealized gain (loss) on investment and foreign exchange contracts	(6)	2	(5)
Total comprehensive income	46	239	161
Less: Comprehensive income (loss) attributable to noncontrolling interest	1	(5)	(2)
Comprehensive income attributable to Meritor, Inc.	$ 47	$ 234	$ 159