DISCONTINUED OPERATIONS (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Discontinued Operations and Disposal Groups [Abstract]
Sales	$ 1	$ 29	$ 29
Operating losses, net (primarily Mascot)	0	(8)	(3)
Net loss on sales of businesses	0	(23)	0
Restructuring costs	0	0	(3)
Environmental remediation charges (see Note 23)	0	(4)	(5)
Other, net	(2)	(2)	(1)
Loss before income taxes	(2)	(37)	(12)
Benefit for income taxes	1	7	5
Loss from discontinued operations attributable to Meritor, Inc.	$ (1)	$ (30)	$ (7)