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Stock-Based Compensation - Stock Repurchase Programs (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Payments for Repurchase of Equity [Abstract]      
Aggregate purchase price $ 3,000us-gaap_StockRepurchasedDuringPeriodValue $ 3,000us-gaap_StockRepurchasedDuringPeriodValue $ 700us-gaap_StockRepurchasedDuringPeriodValue
VMware Stock Repurchase Plan | VMware Class A common stock      
Payments for Repurchase of Equity [Abstract]      
Weighted-average price per share $ 91.61emc_StockRepurchasedDuringPeriodAmountPerShare
/ us-gaap_PlanNameAxis
= emc_VmwareStockRepurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 76.58emc_StockRepurchasedDuringPeriodAmountPerShare
/ us-gaap_PlanNameAxis
= emc_VmwareStockRepurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
$ 91.10emc_StockRepurchasedDuringPeriodAmountPerShare
/ us-gaap_PlanNameAxis
= emc_VmwareStockRepurchasePlanMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember