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Employee Benefits (Tables)
3 Months Ended
Mar. 31, 2013
Compensation And Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost

The components of net periodic benefit cost for the Company’s retirement plans were:

 

     Three Months Ended
March 31,
 
     Pension Plans     

Postretirement

Welfare Plan

 
(Dollars in Millions)    2013     2012      2013     2012  

Service cost

   $ 42      $ 32       $ 1      $ 1   

Interest cost

     42        42         1        2   

Expected return on plan assets

     (44     (48             (1

Prior service cost (credit) and transition obligation (asset) amortization

     (1     (1               

Actuarial loss (gain) amortization

     66        40         (3     (1
                                 

Net periodic benefit cost

   $ 105      $ 65       $ (1   $ 1