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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2011
Employee Stock Purchase Plan Activity
  For the Year Ended
  December 31, 2011 December 31, 2010 December 31, 2009
 Cash Proceeds$141,023 $120,694 $115,312
 Common shares purchased 6,899  6,949  10,324
 Weighted-average price per share$ 20.44 $ 17.37 $ 11.17

  For the Year Ended
  December 31, 2011 December 31, 2010 December 31, 2009
 Cash Proceeds$56,964 $45,162 $18,267
 Class A common shares purchased 816  1,510  907
 Weighted-average price per share$ 69.81 $ 29.90 $ 20.14
Stock Option Activity
  Number of Weighted Average Exercise Price
 Shares  (per share)
 Outstanding, January 1, 2009250,119 $19.14 
  Options granted relating to business acquisitions 24,089  5.68 
  Granted 14,243  15.20 
  Forfeited (10,178)  14.64 
  Expired (14,953)  29.35 
  Exercised (28,402)  8.85 
 Outstanding, December 31, 2009 234,918  18.31 
  Options granted relating to business acquisitions 12,595  5.57 
  Granted 3,286  20.07 
  Forfeited (6,632)  14.36 
  Expired (14,970)  70.59 
  Exercised (56,781)  11.63 
 Outstanding, December 31, 2010172,416  15.23 
  Options granted relating to business acquisitions 141  3.24 
  Granted 1,665  25.31 
  Forfeited (4,159)  13.00 
  Expired (13,866)  40.05 
  Exercised (44,659)  11.91 
 Outstanding, December 31, 2011111,538  13.69 
 Exercisable, December 31, 2011 78,845  13.33 
 Vested and expected to vest, December 31, 2011 109,546 $13.68 

  Number of Weighted Average Exercise Price
 Shares  (per share)
 Outstanding, January 1, 200942,436 $26.54 
  Granted12,500  29.86 
  Forfeited(3,736)  28.11 
  Expired (177)  45.24 
  Exercised (9,516)  22.01 
 Outstanding, December 31, 2009 41,507  28.34 
  Granted 3,362  57.60 
  Forfeited (2,220)  30.78 
  Expired (151)  83.86 
  Exercised (15,574)  24.79 
 Outstanding, December 31, 2010 26,924  33.54 
  Granted 171  5.68 
  Forfeited (1,011)  40.98 
  Expired (112)  101.66 
  Exercised (9,798)  28.64 
 Outstanding, December 31, 201116,174  35.27 
 Exercisable, December 31, 20119,863  32.75 
 Vested and expected to vest 15,808 $35.05 
Restricted Stock and Restricted Stock Unit Activity
  Number of Shares Weighted Average Grant Date Fair Value
 Restricted stock and restricted stock units at January 1, 200928,902 $15.49 
  Granted 21,431  14.58 
  Vested (10,951)  14.83 
  Forfeited (2,019)  15.56 
 Outstanding, December 31, 2009 37,363  15.01 
  Granted 19,261  20.31 
  Vested (11,062)  15.09 
  Forfeited (2,185)  15.82 
 Outstanding, December 31, 201043,377  17.20 
  Granted 20,945  25.12 
  Vested (14,832)  16.44 
  Forfeited (3,959)  20.56 
 Restricted stock and restricted stock units at December 31, 201145,531 $21.10 

  Number of Shares Weighted Average Grant Date Fair Value
 Restricted stock at January 1, 20097,626 $32.35 
  Granted 5,200  33.63 
  Vested (2,881)  31.31 
  Forfeited (734)  34.81 
 Outstanding, December 31, 20099,211  33.21 
  Granted 4,933  74.87 
  Vested (3,688)  32.38 
  Forfeited (704)  39.05 
 Outstanding, December 31, 20109,752  54.17 
  Granted 4,548  91.51 
  Vested (3,853)  35.00 
  Forfeited (907)  64.70 
 Outstanding, December 31, 20119,540 $72.74 
Components of Total Stock-Based Compensation Expense Included in our Consolidated Income Statement
  Year Ended
  December 31, 2011
  Stock Options Restricted Stock Total Stock-Based Compensation
 Cost of product sales $29,504 $31,194 $60,698
 Cost of services  25,221  37,758  62,979
 Research and development  106,556  192,699  299,255
 Selling, general and administrative  164,760  248,479  413,239
 Stock-based compensation expense before income taxes  326,041  510,130  836,171
 Income tax benefit  73,293  119,850  193,143
 Total stock-based compensation, net of tax $252,748 $390,280 $643,028
          
  Year Ended
  December 31, 2010
  Stock Options Restricted Stock Total Stock-Based Compensation
 Cost of product sales $29,586 $20,646 $50,232
 Cost of services  29,493  28,928  58,421
 Research and development  112,484  146,262  258,746
 Selling, general and administrative  156,059  161,595  317,654
 Stock-based compensation expense before income taxes  327,622  357,431  685,053
 Income tax benefit  75,771  89,902  165,673
 Total stock-based compensation, net of tax $251,851 $267,529 $519,380
          
  Year Ended
  December 31, 2009
  Stock Options Restricted Stock Total Stock-Based Compensation
 Cost of product sales $33,423 $15,836 $49,259
 Cost of services  35,004  15,130  50,134
 Research and development  118,875  95,679  214,554
 Selling, general and administrative  189,154  102,605  291,759
 Restructuring charges  (1,015)  (306)  (1,321)
 Stock-based compensation expense before income taxes  375,441  228,944  604,385
 Income tax benefit  78,517  56,326  134,843
 Total stock-based compensation, net of tax $296,924 $172,618 $469,542
Net Change in Amounts Capitalized or Accrued
  Increased (decreased) during the year ended December 31, 2011 Increased (decreased) during the year ended December 31, 2010
 Inventory$111  $(850) 
 Accrued expenses (accrued warranty expenses) (1,702)   553 
 Other assets 4,552   11 
Estimate of Fair Value of Each Option Granted Using Black-Scholes option-pricing model with Weighted-Average Assumptions
  For the Year Ended December 31,
 EMC Stock Options 2011 2010 2009
 Dividend yield  None  None  None
 Expected volatility  33.3%  32.9%  35.4%
 Risk-free interest rate  1.6%  1.8%  2.4%
 Expected term (in years)  4.9  4.8  4.5
 Weighted-average fair value at grant date $8.00 $6.25 $5.04
          
  For the Year Ended December 31,
 EMC Employee Stock Purchase Plan 2011 2010 2009
 Dividend yield  —   —   None
 Expected volatility  —  —  58.1%
 Risk-free interest rate  —  —  0.4%
 Expected term (in years)  —  —  0.5
 Weighted-average fair value at grant date $— $— $3.16

  For the Year Ended December 31,
 VMware Stock Options 2011 2010 2009
 Dividend yield  None   None   None 
 Expected volatility  37.7%  38.0%  36.1%
 Risk-free interest rate  1.0%  1.5%  1.9%
 Expected term (in years)  3.0   3.5   3.7 
 Weighted-average fair value at grant date $88.40  $18.05  $12.18 
             
  For the Year Ended December 31,
 VMware Employee Stock Purchase Plan 2011 2010 2009
 Dividend yield  None   None   None 
 Expected volatility  34.9%  33.1%  50.9%
 Risk-free interest rate  0.2%  0.2%  0.3%
 Expected term (in years)  0.5   0.5   0.5 
 Weighted-average fair value at grant date $23.69  $15.18  $7.79