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Employee Benefits
9 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Employee Benefits
 Note 11
 
  Employee Benefits
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 Plans
            Pension Plans     Postretirement
Welfare Plans
 
(Dollars in Millions)   2023     2022     2023     2022             2023     2022     2023     2022  
Service cost
  $ 56     $ 69     $     $        
 
   $ 168     $ 206     $     $  
Interest cost
    93       62       1              
 
     278       185       2        
Expected return on plan assets
    (137     (119     (1            
 
     (410     (358     (2      
Prior service cost (credit) amortization
          (1     (1            
 
     (1     (2     (2     (2
Actuarial loss (gain) amortization
    1       35       (2     (2  
 
 
 
     3       105       (6     (5
Net periodic benefit cost (a)
  $ 13     $ 46     $ (3   $ (2  
 
 
 
   $ 38     $ 136     $ (8   $ (7
 
(a)
Service cost is included in
compensation and
employee benefits expense on the Consolidated Statement of Income. All other components are included in other noninterest expense on the Consolidated Statement of Income.