COVER PAGE - shares	6 Months Ended
	Mar. 31, 2020	Apr. 29, 2020
Cover [Abstract]
Document type	10-Q
Document quarterly report	true
Document period end date	Mar. 29, 2020
Document transition report	false
Commission file no.	1-15983
Entity registrant name	MERITOR, INC.
Entity incorporation, state or country code	IN
I.R.S. employer identification no.	38-3354643
Address of principal executive offices, line 1	2135 West Maple Road,
Address of principal executive offices, city or town	Troy,
Address of principal executive offices, state	MI
Zip code	48084-7186
City area code	248
Local phone number	435-1000
Title of 12(b) security	Common Stock, $1 Par Value
Trading symbol	MTOR
Security exchange name	NYSE
Entity current reporting status	Yes
Entity interactive data current	Yes
Entity filer category	Large Accelerated Filer
Entity small business	false
Entity emerging growth company	false
Entity shell company	false
Entity common stock, shares outstanding		72,259,278
Amendment flag	false
Entity central index key	0001113256
Current fiscal year end date	--09-30
Document fiscal year focus	2020
Document fiscal period focus	Q2