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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Components of Income Tax Expense
The components of income tax expense were:
 
    Three Months Ended
March 31
 
(Dollars in Millions)       2022         2021  
Federal
               
Current
  $ 404     $ 353  
Deferred
    (102     130  
Federal income tax
    302       483  
State
               
Current
    89       94  
Deferred
    6       30  
     
State income tax
    95       124  
Total income tax provision
  $ 397     $ 607  
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
March 31
 
(Dollars in Millions)       2022         2021  
Tax at statutory rate
  $ 411     $ 607  
State income tax, at statutory rates, net of federal tax benefit
    84       114  
Tax effect of
               
Tax credits and benefits, net of related expenses
    (106     (93
Tax-exempt
income
    (28     (28
Other items
    36       7  
Applicable income taxes
  $ 397     $ 607