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Subsequent Events (Details) (Subsequent Event, USD $)
In Millions, unless otherwise specified
0 Months Ended
Apr. 14, 2015
position
Apr. 29, 2015
position
Facility Closing    
Subsequent Event [Line Items]    
Expected number of positions eliminated 40us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Expected restructuring cost $ 3us-gaap_RestructuringAndRelatedCostExpectedCost1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Commercial Truck & Industrial | South America Labor Reductions | Hourly Positions | Employee Termination Benefits    
Subsequent Event [Line Items]    
Expected number of positions eliminated   233us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_HourlyPositionsMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= mtor_SouthAmericaLaborReductionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Commercial Truck & Industrial | South America Labor Reductions | Salaried Position    
Subsequent Event [Line Items]    
Expected restructuring cost   9us-gaap_RestructuringAndRelatedCostExpectedCost1
/ mtor_LaborReductionsAxis
= mtor_SalariedPositionMember
/ us-gaap_RestructuringPlanAxis
= mtor_SouthAmericaLaborReductionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Commercial Truck & Industrial | South America Labor Reductions | Salaried Position | Employee Termination Benefits    
Subsequent Event [Line Items]    
Expected number of positions eliminated   21us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_SalariedPositionMember
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= mtor_SouthAmericaLaborReductionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember