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Share Repurchases Transactions and Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2017

    $ 7     $ (149 )    $ (168 )    $ 32     $ (278 ) 

Unrealized losses on available-for-sale securities, net of $1 income tax benefit

      (7 )      —       —       —       (7 ) 

Foreign currency translation adjustments

      —       (35 )      —       —       (35 ) 

Change in fair value of derivative instruments, net of $14 of income taxes

      —       —       —       46       46  

Expense (income) reclassified into operations from other comprehensive income, net of $3 income tax benefit and $1 of income taxes, respectively

      —       —       12       (4 )      8  
  

 

 

    

 

 

    

 

 

    

 

 

    

 

 

  

Balances at September 30, 2018

    $ —     $ (184 )    $ (156 )    $ 74     $ (266 )