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Financing Arrangement (Convertible Note Hedge and Warrants Issuance) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended
Jul. 31, 2011
Jul. 14, 2011
Convertible Note Hedge [Member]    
Financing Arrangements    
Amount paid for Convertible Note Hedge $ 107  
Warrants    
Financing Arrangements    
Shares covered by warrants issuance   19.9
Strike price of warrants   $ 41.14
Proceeds from Warrants transaction $ 65  
Convertible Debt    
Financing Arrangements    
Debt Instrument, Convertible, Conversion Price   $ 31.74