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Restructuring Costs (Details Textuals) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Sep. 30, 2014
Dec. 31, 2014
position
Jun. 30, 2015
Sep. 30, 2015
Charges to continuing operations $ 3us-gaap_RestructuringCharges $ 2us-gaap_RestructuringCharges [1] $ 6us-gaap_RestructuringCharges $ 3us-gaap_RestructuringCharges        
Employee Severance                
Charges to continuing operations     6us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		 3us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember		        
South America Labor Reductions | Commercial Truck and Industrial                
Charges to continuing operations         7us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= mtor_SouthAmericaLaborReductionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		      
South America Labor Reductions | Hourly Positions | Commercial Truck and Industrial                
Number of positions eliminated         190us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_HourlyPositionsMember
/ us-gaap_RestructuringPlanAxis
= mtor_SouthAmericaLaborReductionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		      
South America Labor Reductions | Salaried Position | Commercial Truck and Industrial                
Number of positions eliminated         20us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_SalariedPositionMember
/ us-gaap_RestructuringPlanAxis
= mtor_SouthAmericaLaborReductionsMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		      
M2016 Strategy | Commercial Truck and Industrial                
Cumulative restructuring costs           3us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= mtor_M2016StrategyMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		    
M2016 Strategy | Hourly Positions | Commercial Truck and Industrial                
Number of positions eliminated           51us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_HourlyPositionsMember
/ us-gaap_RestructuringPlanAxis
= mtor_M2016StrategyMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		    
M2016 Strategy | Salaried Position | Commercial Truck and Industrial                
Number of positions eliminated           19us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_SalariedPositionMember
/ us-gaap_RestructuringPlanAxis
= mtor_M2016StrategyMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		    
European Labor Reduction | Commercial Truck and Industrial                
Cumulative restructuring costs 2us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= mtor_EuropeanLaborReductionMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		   2us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringPlanAxis
= mtor_EuropeanLaborReductionMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		          
European Labor Reduction | Commercial Truck and Industrial | Scenario, Forecast                
Expected restructuring cost             1us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RestructuringPlanAxis
= mtor_EuropeanLaborReductionMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember		  
European Labor Reduction | Hourly Positions | Commercial Truck and Industrial                
Expected number of positions eliminated           21us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_HourlyPositionsMember
/ us-gaap_RestructuringPlanAxis
= mtor_EuropeanLaborReductionMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		    
European Labor Reduction | Salaried Position | Commercial Truck and Industrial                
Expected number of positions eliminated           23us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ mtor_LaborReductionsAxis
= mtor_SalariedPositionMember
/ us-gaap_RestructuringPlanAxis
= mtor_EuropeanLaborReductionMember
/ us-gaap_StatementBusinessSegmentsAxis
= mtor_CommercialTruckAndIndustrialMember		    
Closure Of Corporate Engineering Facility                
Expected number of positions eliminated 30us-gaap_RestructuringAndRelatedCostExpectedNumberOfPositionsEliminated
/ us-gaap_RestructuringPlanAxis
= mtor_ClosureOfCorporateEngineeringFacilityMember		              
Closure Of Corporate Engineering Facility | Employee Severance                
Cumulative restructuring costs 1us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= mtor_ClosureOfCorporateEngineeringFacilityMember		   1us-gaap_RestructuringAndRelatedCostCostIncurredToDate1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= mtor_ClosureOfCorporateEngineeringFacilityMember		          
Closure Of Corporate Engineering Facility | Lease Termination | Scenario, Forecast                
Expected restructuring cost               $ 2us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_ContractTerminationMember
/ us-gaap_RestructuringPlanAxis
= mtor_ClosureOfCorporateEngineeringFacilityMember
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember
[1] Amounts for prior periods have been recast for discontinued operations.