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Employee Benefits (Tables)
 3 Months Ended
Mar. 31, 2023
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost and Other Amounts Recognized in Accumulated Other Comprehensive Income (Loss)
The components of net periodic benefit cost for the Company’s retirement plans were:
 
    Three Months Ended March 31  
    Pension Plans            Postretirement
Welfare Plans		  
(Dollars in Millions)   2023     2022            2023     2022  
Service cost
   $ 56     $ 69             $ —     $ —  
Interest cost
     93       61               1       —  
Expected return on plan assets
     (137 )      (119 )              (1 )      —  
Prior service cost (credit) amortization
     —       (1 )              (1 )      —  
Actuarial loss (gain) amortization
     1       35               (2 )      (2 ) 
Net periodic benefit cost (a)
   $ 13     $ 45             $ (3 )    $ (2 ) 
 
(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.