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Stock Based Compensation (Details Textuals) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested share-based payment awards $ 8    
Stock Based Compensation (Textuals) [Abstract]      
Instrinsic value of stock options exercised 2    
Total fair value of vested stock options 9 5 4
Employee Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expense for vesting of stock options 8 9 5
Total compensation cost not yet recognized, period for recognition fourth quarter 2015    
Restricted Stock Award [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expense for vesting of stock options 7    
Unvested share-based payment awards 13    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expense for vesting of stock options   $ 7 $ 6
Total compensation cost not yet recognized, period for recognition fourth quarter 2015