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Other Financial Information (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Sep. 30, 2014
Other Financial Information [Line Items]    
Finished products $ 762us-gaap_InventoryFinishedGoods $ 741us-gaap_InventoryFinishedGoods
Raw materials and work in process 1,345us-gaap_InventoryWorkInProcessAndRawMaterials 1,316us-gaap_InventoryWorkInProcessAndRawMaterials
Total 2,107us-gaap_InventoryNet 2,057us-gaap_InventoryNet
Property, plant and equipment, at cost 8,911us-gaap_PropertyPlantAndEquipmentGross 9,411us-gaap_PropertyPlantAndEquipmentGross
Less: Accumulated depreciation 5,341us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 5,609us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total 3,570us-gaap_PropertyPlantAndEquipmentNet 3,802us-gaap_PropertyPlantAndEquipmentNet
Goodwill, net 6,805us-gaap_Goodwill 7,182us-gaap_Goodwill
Goodwill, gross 7,451us-gaap_GoodwillGross 7,828us-gaap_GoodwillGross
Employee compensation 534us-gaap_EmployeeRelatedLiabilitiesCurrent 705us-gaap_EmployeeRelatedLiabilitiesCurrent
Customer advanced payments 466us-gaap_CustomerDepositsCurrent 455us-gaap_CustomerDepositsCurrent
Product warranty 170us-gaap_ProductWarrantyAccrual 193us-gaap_ProductWarrantyAccrual
Pension plans 538us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent 564us-gaap_DefinedBenefitPensionPlanLiabilitiesNoncurrent
Deferred income taxes 543us-gaap_DeferredTaxLiabilitiesNoncurrent 572us-gaap_DeferredTaxLiabilitiesNoncurrent
Postretirement plans, excluding current portion 216us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent 233us-gaap_OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent
Other 661emr_OtherOtherNoncurrentLiabilities 628emr_OtherOtherNoncurrentLiabilities
Total 1,958us-gaap_OtherLiabilitiesNoncurrent 1,997us-gaap_OtherLiabilitiesNoncurrent
Process Management [Member]    
Other Financial Information [Line Items]    
Goodwill, net 2,703us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_ProcessManagementMember
2,701us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_ProcessManagementMember
Industrial Automation [Member]    
Other Financial Information [Line Items]    
Goodwill, net 1,037us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_IndustrialAutomationMember
1,329us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_IndustrialAutomationMember
Network Power [Member]    
Other Financial Information [Line Items]    
Goodwill, net 2,147us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_NetworkPowerMember
2,218us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_NetworkPowerMember
Goodwill, accumulated impairment losses 646us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= emr_NetworkPowerMember
646us-gaap_GoodwillImpairedAccumulatedImpairmentLoss
/ us-gaap_StatementBusinessSegmentsAxis
= emr_NetworkPowerMember
Climate Technologies [Member]    
Other Financial Information [Line Items]    
Goodwill, net 491us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_ClimateTechnologiesMember
500us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_ClimateTechnologiesMember
Commercial & Residential Solutions [Member]    
Other Financial Information [Line Items]    
Goodwill, net $ 427us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_CommercialResidentialSolutionsMember
$ 434us-gaap_Goodwill
/ us-gaap_StatementBusinessSegmentsAxis
= emr_CommercialResidentialSolutionsMember