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Employee Retirement Plans (Tables)
 3 Months Ended
Mar. 31, 2013
Compensation And Retirement Disclosure [Abstract]  
Net Periodic Pension Cost for Defined-Benefit Pension Plans
Net periodic pension cost for the Company’s defined-benefit pension plans was as follows, in millions:

 

     Three Months ended March 31,  
     2013      2012  
     Qualified     Non-Qualified      Qualified     Non-Qualified  

Service cost

    $ 1      $ —         $ 2      $ —     

Interest cost

      10        1         10        1   

Expected return on plan assets

      (9 )      —           (8 )      —     

Amortization of net loss

      4        1         3        1   
  

 

 

    

 

 

     

 

 

    

 

 

  

Net periodic pension cost

    $ 6      $ 2       $ 7      $ 2