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Summary of Significant Accounting Policies (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2011
Apr. 26, 2009
Summary of Significant Accounting Policies (Textuals) [Abstract]    
Accrued potential rebates 100.00%  
License fees recognized over the estimated period of benefit 5 to 10 years  
Gain from settlement of litigation   $ 65
Maximum final maturity period of instrument to invest 3  
Maximum portfolio weighted average maturity period of instrument to invest 18