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DOCUMENT AND ENTITY INFORMATION
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6 Months Ended |
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Mar. 31, 2015
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| Document and Entity Information [Abstract] | |
| Entity Registrant Name | MERITOR INC |
| Entity Central Index Key | 0001113256 |
| Current Fiscal Year End Date | --09-30 |
| Entity Filer Category | Large Accelerated Filer |
| Trading Symbol | MTOR |
| Entity Common Stock, Shares Outstanding | 97,637,773 |
| Document Period End Date | Mar. 31, 2015 |
| Document Type | 10-Q |
| Document Fiscal Period Focus | Q2 |
| Document Fiscal Year Focus | 2015 |
| Amendment Flag | false |