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Stock Based Compensation (Details Textuals) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested share-based payment awards $ 10    
Stock Based Compensation (Textuals) [Abstract]      
Total fair value of vested stock options 8   5
Employee Stock Option [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Recognized compensation expense for vesting of stock options 6 7 9
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 6 5 7
Unvested share-based payment awards $ 15    
Restricted Stock [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost not yet recognized, period for recognition fourth quarter 2015