COVER PAGE - shares	3 Months Ended
	Dec. 31, 2021	Feb. 02, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jan. 02, 2022
Document Transition Report	false
Entity File Number	1-15983
Entity Registrant Name	MERITOR, INC.
Entity Incorporation, State or Country Code	IN
Entity Tax Identification Number	38-3354643
Entity Address, Address Line One	2135 West Maple Road
Entity Address, City or Town	Troy
Entity Address, State or Province	MI
Entity Address, Postal 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 (in shares)		70,774,834
Amendment Flag	false
Entity Central Index Key	0001113256
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1