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Income Taxes (Tables)
9 Months Ended
Sep. 30, 2023
Income Tax Disclosure [Abstract]  
Components of Income Tax Expense
The components of income tax expense were:
 
     Three Months Ended
September 30
            Nine Months Ended
September 30
 
(Dollars in Millions)    2023     2022             2023     2022  
Federal
      
 
    
Current
   $ 416     $ 427    
 
   $ 1,076     $ 1,052  
 
Deferred
     (51     (51  
 
 
 
     (50     (46
Federal income tax
     365       376    
 
     1,026       1,006  
State
      
 
    
Current
     62       150    
 
     277       328  
 
Deferred
     4       (45  
 
 
 
     (35     (42
 
State income tax
     66       105    
 
 
 
     242       286  
Total income tax provision
   $ 431     $ 481    
 
 
 
   $ 1,268     $ 1,292  
Reconciliation of Expected Income Tax Expense at Federal Statutory Rate of 21 Percent to Company's Applicable Income Tax Expense
A reconciliation of expected income tax expense at the federal statutory rate of 21 percent to the Company’s applicable income tax expense follows:
 
     Three Months Ended
September 30
            Nine Months Ended
September 30
 
(Dollars in Millions)    2023     2022             2023     2022  
Tax at statutory rate
   $ 411     $ 482    
 
   $ 1,232     $ 1,302  
State income tax, at statutory rates, net of federal tax benefit
     85       91    
 
     270       259  
Tax effect of
      
 
    
Tax credits and benefits, net of related expenses
     (96     (79  
 
     (236     (231
Tax-exempt
income
     (40     (30  
 
     (115     (87
Other items
     71       17    
 
 
 
     117       49  
Applicable income taxes
   $ 431     $ 481    
 
 
 
   $ 1,268     $ 1,292