CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
NET INCOME (LOSS) ATTRIBUTABLE TO MERITOR, INC.	$ (21)	$ (22)
Foreign currency translation adjustments	(5)	(2)
Unrealized loss on investments and foreign exchange contracts	(1)	(1)
Reclassification adjustment for gain on sale of investments	0	(2)
Comprehensive income (loss) attributable to nonconrolling interest	1	3
Comprehensive loss	(26)	(24)
Comprehensive loss attributable to Meritor, Inc.	(27)	(27)
Accumulated Other Comprehensive Income (Loss) [Member]
Comprehensive loss	$ (6)	$ (5)