DISCONTINUED OPERATIONS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013		Sep. 30, 2012
Discontinued Operations and Disposal Groups [Abstract]
Sales	$ 29	$ 29		$ 36
Operating losses, net (primarily Mascot)	(8)	(3)		0
Net gain (loss) on sales of businesses	(23)	0		(1)
Charge for contingency and indemnity obligation (see Note 22)	0	0		(10)
Restructuring costs	0	(3)	[1]	(1)	[1]
Environmental remediation charges (see Note 22)	(4)	(5)		(3)
Other, net	(2)	(1)		(5)
Income (loss) before income taxes	(37)	(12)		(20)
Benefit for income taxes	7	5		3
Loss from discontinued operations attributable to Meritor, Inc.	$ (30)	$ (7)		$ (17)

[1] Charges to discontinued operations are included in discontinued operations in the consolidated statement of operations. Amounts for prior periods have been recast for discontinued operations.