CONDENSED CONSOLIDATED STATEMENT OF OPERATIONS - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Sales	$ 984	$ 889
Cost of sales	(857)	(774)
GROSS PROFIT	127	115
Selling, general and administrative	(62)	(65)
Other operating expense, net	(3)	(7)
OPERATING INCOME	62	43
Other income, net	14	14
Equity in earnings of affiliates	7	11
Interest expense, net	(13)	(28)
INCOME BEFORE INCOME TAXES	70	40
Provision for income taxes	(12)	(7)
INCOME FROM CONTINUING OPERATIONS	58	33
INCOME FROM DISCONTINUED OPERATIONS, net of tax	0	0
NET INCOME	58	33
Less: Net income attributable to noncontrolling interests	(4)	(1)
Net income	54	32
NET INCOME ATTRIBUTABLE TO MERITOR, INC.
Net income from continuing operations	54	32
Income from discontinued operations	0	0
Net income	$ 54	$ 32
BASIC EARNINGS PER SHARE
Continuing operations (in usd per share)	$ 0.77	$ 0.44
Discontinued operations (in usd per share)	0	0
Basic earnings per share (in usd per share)	0.77	0.44
DILUTED EARNINGS PER SHARE
Continuing operations (in usd per share)	0.76	0.44
Discontinued operations (in usd per share)	0	0
Diluted earnings per share (in usd per share)	$ 0.76	$ 0.44
Basic average common shares outstanding (in shares)	70.2	72.2
Diluted average common shares outstanding (in shares)	71.2	73.2