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Stock Options and Other Stock Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Plan
Dec. 31, 2010
Dec. 31, 2009
Stock Options and Other Stock Based Compensation      
Number of non-qualified plans of the entity (in number of plans) 5    
Shares authorized under the plans (in shares) 6,922,000    
Shares available for grants under the plans (in shares) 6,922,000    
Compensation cost for all grants of shares and units $ 1 $ 11 $ 20
Stock Options | Shares granted to employees prior to March 22, 2005
     
Share-based Compensation Arrangement by Share-based Payment Award      
Period after which the options granted can be exercisable (in years) 1    
Percentage of options which become exercisable on the fifth anniversary of the date of option grant (as a percent) 50.00%    
Percentage of remaining options which become exercisable on the sixth anniversary of the date of option grant (as a percent) 50.00%    
Fair value of options, amortization period, high end range (in years) 5    
Options Expire after this anniversary 10th Anniversary    
Stock Options | Shares granted to employees after March 21, 2005
     
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of options exercisable per year beginning on the first anniversary from date of option granted (as a percent) 25.00%    
Options Expire after this anniversary 7th Anniversary    
Stock Options | Shares granted to employees after March 21, 2005 | Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award      
Fair value of options, amortization period 1    
Stock Options | Shares granted to employees after March 21, 2005 | Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award      
Fair value of options, amortization period 4