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Acquisitions and Divestitures (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 30, 2014
Mar. 31, 2015
Significant Acquisitions and Disposals [Line Items]        
Net sales $ 5,587us-gaap_SalesRevenueNet $ 5,606us-gaap_SalesRevenueNet    
Payments to acquire businesses, net of cash acquired 143us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired 576us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired    
Goodwill 6,940us-gaap_Goodwill   7,182us-gaap_Goodwill  
Earnings (loss) before income taxes 765us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 643us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest    
Net earnings (loss) 529us-gaap_ProfitLoss 477us-gaap_ProfitLoss    
Series of Individually Immaterial Business Acquisitions [Member]        
Significant Acquisitions and Disposals [Line Items]        
Number of individually immaterial businesses acquired 3us-gaap_NumberOfBusinessesAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Net sales 32us-gaap_SalesRevenueNet
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Payments to acquire businesses, net of cash acquired 143us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Goodwill 73us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Goodwill, expected tax deductible amount 42us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Business combination, recognized identifiable assets acquired and liabilities assumed, finite-lived intangibles 61us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles
/ us-gaap_BusinessAcquisitionAxis
= us-gaap_SeriesOfIndividuallyImmaterialBusinessAcquisitionsMember
     
Acquired finite-lived intangible assets, weighted average useful life 11 years      
Power Transmission Solutions [Member]        
Significant Acquisitions and Disposals [Line Items]        
Net sales     605us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
 
Earnings (loss) before income taxes     87us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
 
Assets held-for-sale, other current assets 180us-gaap_AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
     
Assets held-for-sale, other assets 377us-gaap_DisposalGroupIncludingDiscontinuedOperationOtherNoncurrentAssets
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
     
Liabilities held-for-sale, accrued expenses 81us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
     
Liabilities held-for-sale, other liabilities 16us-gaap_LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationNoncurrent
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
     
Artesyn (embedded computing and power) and connectivity solutions [Member]        
Significant Acquisitions and Disposals [Line Items]        
Net sales   164us-gaap_SalesRevenueNet
/ dei_LegalEntityAxis
= emr_ArtesynembeddedcomputingandpowerandconnectivitysolutionsMember
   
Earnings (loss) before income taxes   (10)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ dei_LegalEntityAxis
= emr_ArtesynembeddedcomputingandpowerandconnectivitysolutionsMember
   
Percentage of controlling interest sold   51.00%emr_Percentageofcontrollinginterestsold
/ dei_LegalEntityAxis
= emr_ArtesynembeddedcomputingandpowerandconnectivitysolutionsMember
   
Net earnings (loss)   (8)us-gaap_ProfitLoss
/ dei_LegalEntityAxis
= emr_ArtesynembeddedcomputingandpowerandconnectivitysolutionsMember
   
Subsequent Event [Member] | Power Transmission Solutions [Member]        
Significant Acquisitions and Disposals [Line Items]        
Proceeds from divestiture of business       1,400us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
After-tax proceeds from divestiture of business       1,000emr_Aftertaxproceedsfromdivestitureofbusiness
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Gain (loss) on disposal       $ 520us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Impact on diluted earnings per share of disposal gain       $ 0.75emr_DisposalGroupNotdiscontinuedOperationGainLossonDisposalImpactonDilutedEarningsPerShare
/ dei_LegalEntityAxis
= emr_PowerTransmissionSolutionsMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember