DOCUMENT AND ENTITY INFORMATION (USD $)	12 Months Ended
	Sep. 30, 2014	Nov. 17, 2014	Mar. 28, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	MERITOR INC
Entity Central Index Key	0001113256
Current Fiscal Year End Date	--09-28
Entity Filer Category	Large Accelerated Filer
Trading Symbol	MTOR
Entity Common Stock, Shares Outstanding		97,844,611
Document Period End Date	Sep. 28, 2014
Document Type	10-K
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2014
Amendment Flag	false
Entity Well-Known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 1,147,375,565