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Income Tax (Tables)
3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]  
Difference Between Effective Tax Rate

The difference between the effective tax rate reflected in the provision for income taxes and the U.S. federal statutory rate of 35% was as follows (in millions):

 

     Three Months Ended
March 31,
 
     2014     2013  

Federal income tax at U.S. federal statutory rate

   $ 22      $ 21   

Foreign income tax rate differential

     (2     (2

State income tax, net of federal benefit

     1        1   

Other

     —          (1
  

 

 

   

 

 

 

Provision for income taxes

   $ 21      $ 19