CONDENSED CONSOLIDATED STATEMENT 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	$ 14	$ 234	$ 87	$ 250
Foreign currency translation adjustments:
Attributable to Meritor, Inc.	13	8	(54)	8
Attributable to noncontrolling interest	0	0	(1)	0
Other reclassification adjustment	0	0	1	0
Pension and other postretirement benefit related adjustments	12	11	35	31
Unrealized gain (loss) on investments and foreign exchange contracts	(2)	0	(3)	2
Other comprehensive income (loss), net of tax	23	19	(22)	41
Total comprehensive income	37	253	65	291
Less: Comprehensive income attributable to noncontrolling interest	(1)	0	(1)	(4)
Comprehensive income attributable to Meritor, Inc.	$ 36	$ 253	$ 64	$ 287