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Other Deductions, Net (Schedule Of Other Deductions, Net) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Other deductions, net [Line Items]        
Amortization of intangibles $ 53emr_AmortizationOfIntangiblesIntellectualPropertyAndCustomerRelationships $ 58emr_AmortizationOfIntangiblesIntellectualPropertyAndCustomerRelationships $ 108emr_AmortizationOfIntangiblesIntellectualPropertyAndCustomerRelationships $ 115emr_AmortizationOfIntangiblesIntellectualPropertyAndCustomerRelationships
Rationalization of operations 44us-gaap_RestructuringCharges 21us-gaap_RestructuringCharges 53us-gaap_RestructuringCharges 34us-gaap_RestructuringCharges
Other 39us-gaap_OtherNonoperatingIncomeExpense 58us-gaap_OtherNonoperatingIncomeExpense 39us-gaap_OtherNonoperatingIncomeExpense 83us-gaap_OtherNonoperatingIncomeExpense
Total 136emr_OtherDeductionsNet 137emr_OtherDeductionsNet 200emr_OtherDeductionsNet 232emr_OtherDeductionsNet
Income (loss) from equity method investment   (34)us-gaap_IncomeLossFromEquityMethodInvestments    
Change in gain (loss) from foreign currency exchange transactions     $ 20emr_ChangeInGainLossFromForeignCurrencyExchangeTransactions