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Other Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Other Assets, Noncurrent [Abstract]    
Investments in non-consolidated joint ventures $ 101mtor_EquityMethodInvestmentsSeriesOfIndividuallyImmaterialInvestments $ 106mtor_EquityMethodInvestmentsSeriesOfIndividuallyImmaterialInvestments
Asbestos-related recoveries (see Note 19) 42mtor_AsbestosRelatedRecoveries 45mtor_AsbestosRelatedRecoveries
Unamortized debt issuance costs 27us-gaap_UnamortizedDebtIssuanceExpense 30us-gaap_UnamortizedDebtIssuanceExpense
Capitalized software costs, net 26us-gaap_CapitalizedComputerSoftwareNet 25us-gaap_CapitalizedComputerSoftwareNet
Non-current deferred income tax assets, net 17us-gaap_DeferredTaxAssetsNetNoncurrent 15us-gaap_DeferredTaxAssetsNetNoncurrent
Assets for uncertain tax positions 5mtor_AssetForUncertainTaxPositions 5mtor_AssetForUncertainTaxPositions
Prepaid pension costs 109us-gaap_PrepaidPensionCosts 104us-gaap_PrepaidPensionCosts
Other 17us-gaap_OtherAssetsMiscellaneousNoncurrent 25us-gaap_OtherAssetsMiscellaneousNoncurrent
Other assets $ 344us-gaap_OtherAssetsNoncurrent $ 355us-gaap_OtherAssetsNoncurrent