v2.4.0.6
Common Stock and Stock Plans, Restricted Share Rights (Details) (Restricted Share Rights [Member], USD $)
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Restricted Share Rights [Member]
     
Summary of Restricted Share Rights and Restricted Share Awards [Abstract]      
Nonvested, fair value, beginning of period $ 26.98    
Nonvested, shares, beginning of period 23,036,722    
Granted, shares 18,836,636    
Granted, weighted-average grant-date fair value $ 31.02 $ 27.29 $ 19.04
Vested, shares (1,426,158)    
Vested, weighted-average grant-date fair value $ 28.55    
Canceled or forfeited, shares (1,167,071)    
Canceled or forfeited, weighted-average grant-date fair value $ 28.52    
Nonvested, fair value, end of period $ 28.81 $ 26.98  
Nonvested, shares, end of period 39,280,129 23,036,722