CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Statement [Abstract]
Sales	$ 909	$ 979	$ 2,652	$ 2,833
Cost of sales	(785)	(855)	(2,298)	(2,486)
GROSS MARGIN	124	124	354	347
Selling, general and administrative	(65)	(53)	(187)	(178)
Restructuring costs	(9)	0	(15)	(3)
Other operating income (expense), net	1	(1)	2	(2)
OPERATING INCOME (LOSS)	51	70	154	164
Other income (expense), net	(1)	0	3	0
Equity in earnings of ZF Meritor	0	190	0	190
Equity in earnings of other affiliates	10	11	28	28
Interest expense, net	(38)	(22)	(78)	(97)
INCOME BEFORE INCOME TAXES	22	249	107	285
Provision for income taxes	(6)	(12)	(19)	(31)
INCOME FROM CONTINUING OPERATIONS	16	237	88	254
LOSS FROM DISCONTINUED OPERATIONS, net of tax	(2)	(3)	(1)	(4)
NET INCOME	14	234	87	250
Less: Net income attributable to noncontrolling interests	(1)	0	(2)	(4)
NET INCOME ATTRIBUTABLE TO MERITOR, INC.	13	234	85	246
NET INCOME ATTRIBUTABLE TO MERITOR, INC.
Net income from continuing operations	15	237	86	250
Loss from discontinued operations	(2)	(3)	(1)	(4)
NET INCOME ATTRIBUTABLE TO MERITOR, INC.	$ 13	$ 234	$ 85	$ 246
BASIC EARNINGS (LOSS) PER SHARE
Continuing operations (in dollars per share)	$ 0.15	$ 2.43	$ 0.88	$ 2.56
Discontinued operations (in dollars per share)	(0.02)	(0.03)	(0.01)	(0.04)
Basic earnings per share (in dollars per share)	0.13	2.40	0.87	2.52
DILUTED EARNINGS (LOSS) PER SHARE
Continuing operations (in dollars per share)	0.15	2.34	0.85	2.52
Discontinued operations (in dollars per share)	(0.02)	(0.03)	(0.01)	(0.04)
Diluted earnings per share (in dollars per share)	$ 0.13	$ 2.31	$ 0.84	$ 2.48
Basic average common shares outstanding (in shares)	96.9	97.6	97.6	97.5
Diluted average common shares outstanding (in shares)	100.3	101.1	101.0	99.1