Income Taxes (Details Textuals) (USD $) In Millions, unless otherwise specified	6 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Net pre-tax income (loss) in which a tax benefit is not recorded	$ 36	$ (34)

Net pre-tax income (loss) for which a tax benefit is not recorded.

No definition available.

Name:	mtor_NetPreTaxIncomeLossTaxBenefitNotRecorded
Namespace Prefix:	mtor_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration