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Employee Benefits (Tables)
9 Months Ended
Sep. 30, 2020
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 September 30             Nine Months Ended September 30  
    Pension Plans     Postretirement
Welfare Plan
            Pension Plans     Postretirement
Welfare Plan
 
(Dollars in Millions)   2020     2019     2020     2019             2020     2019     2020     2019  
Service cost
  $ 58     $ 48     $     $    
 
   $ 176     $ 144     $     $  
Interest cost
    59       63             1    
 
     176       187       1       2  
Expected return on plan assets
    (101     (96           (1  
 
     (302     (287     (2     (2
Prior service cost (credit) amortization
                      (1  
 
                 (2     (3
Actuarial loss (gain) amortization
    34       24       (2     (1  
 
 
 
     101       73       (5     (4
Net periodic benefit cost (a)
  $ 50     $ 39     $ (2   $ (2  
 
 
 
   $ 151     $ 117     $ (8   $ (7
 
(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.