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Selected Quarterly Financial Data (Unaudited) - Additional Information (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Effect of Fourth Quarter Events [Line Items]                  
Research and Development tax credit, amount $ 62us-gaap_IncomeTaxReconciliationTaxCreditsResearch         $ 60us-gaap_IncomeTaxReconciliationTaxCreditsResearch      
Research and Development tax credit, per share impact $ 0.03emc_ResearchandDevelopmenttaxcreditpershareimpact         $ 0.03emc_ResearchandDevelopmenttaxcreditpershareimpact      
Gain on strategic investment, net of tax (33)emc_GainonPreviouslyheldStrategicinvestmentandjointventure (45)emc_GainonPreviouslyheldStrategicinvestmentandjointventure              
Gain on strategic investment, net of tax, per diluted share $ 0.02emc_Gainonpreviouslyheldstrategicinvestmentandjointventurepershare $ 0.02emc_Gainonpreviouslyheldstrategicinvestmentandjointventurepershare              
Impairment of strategic investment   24us-gaap_ImpairmentOfInvestments         33us-gaap_ImpairmentOfInvestments 0us-gaap_ImpairmentOfInvestments 0us-gaap_ImpairmentOfInvestments
Other Than Temporary Impairment Losses, Investments, per share impact   $ 0.01emc_OtherThanTemporaryImpairmentLossesInvestmentspershareimpact              
Gain on disposition of business       11us-gaap_GainLossOnSaleOfBusiness 10us-gaap_GainLossOnSaleOfBusiness        
Net gain on disposition of business, per share impact       $ 0.01emc_Netgainondispositionofbusinesspershareimpact $ 0.01emc_Netgainondispositionofbusinesspershareimpact        
Tax Related Reorganization     $ 4us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions $ 23us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions          
Tax Related Reorganization, Earnings Per Share Impact, Net     $ 0.00us-gaap_UnusualOrInfrequentItemEarningsPerShareImpactNet $ (0.01)us-gaap_UnusualOrInfrequentItemEarningsPerShareImpactNet