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Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2013
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 September 30 2013 2012 2013 2012 
                 
     (Dollars in millions) 
 Service cost  $ 32 $ 28 $ 2 $ 2 
 Interest cost    27   25   2   2 
 Estimated return on plan assets    (65)   (51)     
 Amortization and other    20   18   3   2 
  Net periodic benefit cost  $ 14 $ 20 $ 7 $ 6 

     Qualified Plan Nonqualified Plans 
 Nine Months Ended September 30 2013  2012 2013 2012 
                 
     (Dollars in millions) 
 Service cost  $ 106 $ 86 $ 8 $ 6 
 Interest cost    81   74   9   7 
 Estimated return on plan assets    (193)   (149)     
 Amortization and other    60   52   9   4 
  Net periodic benefit cost  $ 54 $ 63 $ 26 $ 17