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Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [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, 2016
  $
7
    $
(211
 )   $
(146
 )   $
12
    $
(338
 )
Unrealized gains on
available-for-sale
securities
    
1
     
—
      
—
      
—
      
1
 
Foreign currency translation adjustments, net of $35 of income taxes
   
—
      
62
     
—
      
—
      
62
 
Defined benefit plans, net of $10 income tax benefit
   
—
      
—
      
(33
 )    
—
      
(33
 )
Change in fair value of derivative instruments, net of $4 of income taxes
   
—
      
—
      
—
      
7
     
7
 
Expense (income) reclassified into operations from other comprehensive income, net of $1 of income taxes and $7 and $7 income tax benefits, respectively
   
(1
 )    
—
      
11
     
13
     
23
 
                                         
Balances at December 31, 2017
   
7
     
(149
 )    
(168
 )    
32
     
(278
 )
Unrealized losses on
available-for-sale
securities, net of $2 income tax benefit
    
(5
 )    
—
      
—
      
—
      
(5
 )
Foreign currency translation adjustments, net of $8 income tax benefit
   
—
      
(63
 )    
—
      
—
      
(63
 )
Defined benefit plans, net of $10 of income taxes
   
—
      
—
      
34
     
—
      
34
 
Change in fair value of derivative instruments, net of $5 of income taxes
   
—
      
—
      
—
      
18
     
18
 
Expense (income) reclassified into operations from other comprehensive income, net of $5 income tax benefit and $2 of income taxes, respectively
   
—
      
—
      
16
     
(8
 )    
8
 
Reclassification of stranded tax effects
   
1
     
(71
 )    
(30
 )    
5
      
(95
 )
                                         
Balances at December 31, 2018
   
3
     
(283
 )    
(148
 )    
47
     
(381
 )
Unrealized
gains
 on
available-for-sale
securities, net of $4 of income taxes
  
 
11
 
  
 
—
 
  
 
—
 
  
 
—
 
  
 
11
 
Foreign currency translation adjustments, net of $5 of income taxes
 
 
—
 
  
 
—
 
  
 
—
 
  
 
—
 
  
 
—
 
Defined benefit plans, net of $14 income tax benefit
 
 
—
 
  
 
—
 
  
 
(49
)
 
 
—
 
  
 
(49
)
Change in fair value of derivative instruments, net of $13 income tax benefit
 
 
—
 
  
 
—
 
  
 
—
 
  
 
(37
)
 
 
(37
)
Expense (income) reclassified into operations from other comprehensive income, net of $3 income tax benefit and $3 of income taxes, respectively
 
 
—
 
  
 
—
 
  
 
10
 
  
 
(14
)
 
 
(4
)
                                         
Balances at December 31, 2019
 
$
14
 
  
$
(283
)
 
$
(187
)
 
$
(4
)
 
$
(460
)