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Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2014
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure  
Summary of the components of net periodic benefit cost recognized for pension plans
     Qualified Plan Nonqualified Plans 
 Three Months Ended June 30 2014 2013 2014 2013 
                 
     (Dollars in millions) 
 Service cost  $ 32 $ 37 $ 3 $ 3 
 Interest cost    31   27   3   4 
 Estimated return on plan assets    (74)   (64)     
 Amortization and other    1   20   3   3 
  Net periodic benefit cost  $ (10) $ 20 $ 9 $ 10 

     Qualified Plan Nonqualified Plans 
 Six Months Ended June 30 2014  2013 2014 2013 
                 
     (Dollars in millions) 
 Service cost  $ 65 $ 74 $ 6 $ 6 
 Interest cost    62   54   7   7 
 Estimated return on plan assets    (148)   (128)     
 Amortization and other    1   40   6   6 
  Net periodic benefit cost  $ (20) $ 40 $ 19 $ 19