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Acquisitions/Divestitures (Details 2) (USD $)
In Millions, except Per Share data
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2010
Dassault Systems
Acquisitions/Divestitures        
Number of divestitures $ 2      
Divestitures:        
Proceeds from divestiture   $ 4 $ 0 $ 459
Gain (loss) on divestiture       $ 591