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Share Repurchase Transactions and Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2021
Federal Home Loan Banks [Abstract]  
Components of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows (dollars in millions):
 
   
Unrealized
Gains on
Available-
for-Sale

Securities
    
Foreign
Currency
Translation
Adjustments
    
Defined
Benefit
Plans
    
Change
in Fair
Value of
Derivative
Instruments
    
Total
  
Balances at December 31, 2020
   $ 25     $ (271 )    $ (220 )    $ (36 )    $ (502 ) 
Unrealized losses on
available-for-sale
securities, net of $2 income tax benefit
     (7 )                              (7 ) 
Foreign currency translation adjustments, net of $2 of income taxes
             9                       9  
Expense reclassified into operations from other comprehensive income, net of $3 and $4 income tax benefits, respectively
                     11       14       25  
   
 
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Balances at June 30, 2021
   $ 18     $ (262 )    $ (209 )    $ (22 )    $ (475 )