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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, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Options and Other Stock Based Compensation      
Shares available for grants under the plans 4,644,000    
Compensation cost for all grants of shares and units $ 11 $ 11 $ 1
Stock Options
     
Share-based Compensation Arrangement by Share-based Payment Award      
Number of options may be exercised in whole or in part during the first year after the date granted 1,414,000    
Stock Options | Shares granted to employees prior to March 22, 2005
     
Share-based Compensation Arrangement by Share-based Payment Award      
Number of options may be exercised in whole or in part during the first year after the date granted 0    
Options expiration period 10 years    
Stock Options | Shares granted to employees after March 21, 2005
     
Share-based Compensation Arrangement by Share-based Payment Award      
Number of options may be exercised in whole or in part during the first year after the date granted 0    
Percentage of options exercisable per year beginning on the first anniversary from date of option granted 25.00%    
Options expiration period 7 years    
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 year    
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 years