Income Taxes (Details Textuals) (USD $) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]
Net Pre Tax Losses Tax Benefitis Not Recorded	$ 31	$ 54

Net pre-tax losses for which a tax benefit is not recorded.

No definition available.

Name:	mtor_NetPreTaxLossesTaxBenefitisNotRecorded
Namespace Prefix:	mtor_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration