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Other Current Assets (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Other Current Assets Disclosure [Abstract]    
Current deferred income tax assets $ 18us-gaap_DeferredTaxAssetsNetCurrent $ 21us-gaap_DeferredTaxAssetsNetCurrent
Asbestos-related recoveries (see Note 19) 14mtor_AsbestosRelatedInsuranceRecoveriesCurrent 15mtor_AsbestosRelatedInsuranceRecoveriesCurrent
Deposits and collateral 2us-gaap_DepositAssets 4us-gaap_DepositAssets
Prepaid and other 21us-gaap_PrepaidExpenseAndOtherAssetsCurrent 16us-gaap_PrepaidExpenseAndOtherAssetsCurrent
Other current assets $ 55us-gaap_OtherAssetsCurrent $ 56us-gaap_OtherAssetsCurrent