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Employee Benefits (Tables)
6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
The components of net periodic benefit cost for the
Company’s
retirement plans were:
 
                                                                               
    Three Months Ended June 30           Six Months Ended June 30  
    Pension Plans       Postretirement
Welfare Plan
          Pension Plans         Postretirement
Welfare Plan
 
(Dollars in Millions)   2019     2018       2019     2018           2019     2018         2019     2018  
Service cost
  $ 48     $ 52       $     $             $ 96     $ 104         $     $  
Interest cost
    62       56                             124       112           1       1  
Expected return on plan assets
    (96 )     (94 )             (1             (191 )     (189 )         (1 )     (2
Prior service cost (credit) amortization
                  (1 )                                   (2 )     (1 )
Actuarial loss (gain) amortization
    25       36         (2 )     (1 )             49       73           (3 )     (3 )
Net periodic benefit cost (a)
  $ 39     $ 50       $ (3 )   $ (2 )           $ 78     $ 100         $ (5 )   $ (5 )
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(a)
Service cost is included in employee benefits expense on the Consolidated Statement of Income. All other components are included in other noninterest expense on the Consolidated Statement of Income.