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Stock Options and Other Stock Based Compensation (Details 3) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Options and Other Stock Based Compensation      
Unrecognized compensation cost of unvested stock options, restricted shares and performance vested restricted share units (in dollars) $ 16    
Weighted average period during which unrecognized compensation costs would be recognized (in years) 3    
Shares granted to directors prior to 2008
     
Restricted share and Performance Vested Restricted Share Units      
Period within which shares vested cannot be sold (in years) 3    
Restricted Shares and Restricted Share Units | Shares granted to employees prior to March 22, 2005
     
Restricted share and Performance Vested Restricted Share Units      
Period after which shares granted can be vested (in years) 3    
Restricted Shares and Restricted Share Units | Shares granted to employees after March 21, 2005
     
Restricted share and Performance Vested Restricted Share Units      
Percentage of shares vested per year beginning on first anniversary (as a percent) 25.00%    
Restricted Shares and Restricted Share Units | Shares granted to employees after March 21, 2005 | Minimum
     
Restricted share and Performance Vested Restricted Share Units      
Fair value of restricted shares, amortization period (in years) 1    
Restricted Shares and Restricted Share Units | Shares granted to employees after March 21, 2005 | Maximum
     
Restricted share and Performance Vested Restricted Share Units      
Fair value of restricted shares, amortization period (in years) 4    
Restricted Shares
     
Restricted share and Performance Vested Restricted Share Units      
Nonvested, beginning balance (in shares) 536,000    
Granted (in shares) 156,000    
Vested (in shares) (152,000)    
Forfeited (in shares) (29,000)    
Nonvested, ending balance (in shares) 511,000 536,000  
Nonvested, Beginning balance (in dollars per share) $ 20.11    
Granted (in dollars per share) $ 29.99 $ 31.30 $ 11.85
Vested (in dollars per share) $ 23.50    
Forfeited (in dollars per share) $ 23.49    
Nonvested, Closing balance (in dollars per share) $ 21.94 $ 20.11  
Total fair value of shares vested (in dollars) $ 4 $ 5 $ 4
Restricted Shares | Shares granted to directors after 2007
     
Restricted share and Performance Vested Restricted Share Units      
Period after which shares granted can be vested (in years) 1    
Restricted Share Units
     
Restricted share and Performance Vested Restricted Share Units      
Shares of common stock received, per unit, by holders of vested units 1    
Restricted Share Units | Shares granted to employees after 2010
     
Restricted share and Performance Vested Restricted Share Units      
Percentage of shares vested per year beginning on first anniversary (as a percent) 25.00%    
Performance Vested Restricted Share Units
     
Restricted share and Performance Vested Restricted Share Units      
Nonvested, beginning balance (in shares) 1,220,000    
Granted (in shares) 253,000    
Forfeited (in shares) (194,000)    
Nonvested, ending balance (in shares) 1,279,000 1,220,000  
Nonvested, Beginning balance (in dollars per share) $ 19.99    
Granted (in dollars per share) $ 29.70 $ 31.10 $ 10.30
Forfeited (in dollars per share) $ 45.37    
Nonvested, Closing balance (in dollars per share) $ 18.06 $ 19.99  
Period after which shares granted can be vested (in years) 3    
Performance Vested Restricted Share Units | Minimum
     
Restricted share and Performance Vested Restricted Share Units      
Shares of common stock received, per unit, by holders of vested units 0.5    
Performance Vested Restricted Share Units | Maximum
     
Restricted share and Performance Vested Restricted Share Units      
Shares of common stock received, per unit, by holders of vested units 2.0