v2.4.0.8
Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Taxes (Textual) [Abstract]        
Income tax provision $ 11 $ 26 $ 21 $ 47
Effective tax rate 20.30% 23.30% 19.70% 23.90%
Likelihood of uncertain tax positions     greater than 50%  
Tax benefit     50.00%  
Unrecognized tax benefits 8   8  
Interest accrued for unrecognized tax benefits $ 1   $ 1