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Supplemental Guarantor Condensed Consolidating Financial Statements (Details Textual) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2015
Sep. 30, 2014
Condensed Financial Statements, Captions [Line Items]      
Company's overall ownership, as a percentage   100.00%us-gaap_EquityMethodInvestmentOwnershipPercentage  
Threshold for reporting consolidating financial statements   25.00%mtor_ThresholdForReportingConsolidatingFinancialStatements  
Amount of restricted net assets for consolidated and unconsolidated subsidiaries   $ 31us-gaap_AmountOfRestrictedNetAssetsForConsolidatedAndUnconsolidatedSubsidiaries  
Parent      
Condensed Financial Statements, Captions [Line Items]      
Pension and retiree medical benefit obligations   662us-gaap_DefinedBenefitPlanBenefitObligation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
684us-gaap_DefinedBenefitPlanBenefitObligation
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
Cash dividends paid to the Parent 5mtor_ProceedsfromConsolidatedSubsidiariesandEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
37mtor_ProceedsfromConsolidatedSubsidiariesandEquityMethodInvestments
/ dei_LegalEntityAxis
= us-gaap_ParentCompanyMember
 
Subsidiaries [Member]      
Condensed Financial Statements, Captions [Line Items]      
Debt and capital lease obligations   $ 42us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember
$ 55us-gaap_DebtAndCapitalLeaseObligations
/ dei_LegalEntityAxis
= us-gaap_SubsidiariesMember