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Stock Options and Other Stock Based Compensation (Details 2) (Stock Options, USD $)
In Millions, except Share data in Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Year
Dec. 31, 2010
Dec. 31, 2009
Stock Options
      
Number of Shares      
Options outstanding, Beginning balance (in shares) 4,048    
Granted (in shares) 548    
Exercised (in shares) (340)    
Forfeited or expired (in shares) (212)    
Options outstanding, ending balance (in shares) 4,044 4,048  
Options vested or expected to vest (in shares) 3,991    
Options exercisable (in shares) 2,450    
Weighted Average Exercise Price (per share)      
Options outstanding, Beginning balance (in dollars per share) $ 20.60    
Granted (in dollars per share) $ 29.68    
Exercised (in dollars per share) $ 15.32    
Forfeited or expired (in dollars per share) $ 21.98    
Options outstanding, Closing balance (in dollars per share) $ 22.20 $ 20.60  
Options vested or expected to vest (in dollars per share) $ 22.20    
Options exercisable (in dollars per share) $ 21.78    
Weighted Average Remaining Contractual Term (in years)      
Options outstanding, Closing balance (in years) 3.6    
Options vested or expected to vest (in years) 3.6    
Options exercisable (in years) 2.8    
Aggregate Intrinsic Value      
Options outstanding, Closing balance (in dollars) $ 13    
Options vested or expected to vest (in dollars) 13    
Options exercisable (in dollars) 7    
Weighted average grant-date fair value of options granted (in dollars per share) $ 13.70 $ 14.60 $ 4.23
Aggregate intrinsic value of options exercised (in dollars) 4 5 3
Aggregate cash received from options exercised (in dollars) $ 5 $ 5 $ 7