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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Mar. 31, 2015
Changes in Goodwill  
Beginning balance $ 431us-gaap_Goodwill
Foreign currency translation (17)us-gaap_GoodwillTranslationAdjustments
Ending balance 414us-gaap_Goodwill
Commercial Truck & Industrial  
Changes in Goodwill  
Beginning balance 261us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
Foreign currency translation (9)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
Ending balance 252us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
Commercial Truck & Industrial | Defense Reporting Unit  
Changes in Goodwill  
Ending balance 20us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
/ us-gaap_SubsegmentsAxis
= mtor_DefenseReportingUnitMember
Aftermarket & Trailer  
Changes in Goodwill  
Beginning balance 170us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_AftermarketAndTrailerMember
Foreign currency translation (8)us-gaap_GoodwillTranslationAdjustments
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_AftermarketAndTrailerMember
Ending balance $ 162us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_AftermarketAndTrailerMember