v2.4.0.6
Common Stock and Stock Plans, Summary of Performance Awards (Details) (Performance Share Awards [Member], USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Performance Share Awards [Member]
     
Summary of Performance Awards [Abstract]      
Nonvested, fair value, beginning of period $ 27.32    
Nonvested, shares, beginning of period 2,564,584    
Number of performance shares granted 3,853,274    
Granted, weighted-average grant-date fair value $ 31.26 $ 27.46 $ 27.09
Vested, shares 0    
Canceled or forfeited, shares (12,893)    
Canceled or forfeited, weighted-average grant-date fair value $ 31.33    
Nonvested, fair value, end of period $ 29.68 $ 27.32  
Nonvested, shares, end of period 6,404,965 2,564,584