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Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2020
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, 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
) 
Unrealized gains on
available-for-sale
securities, net of $3 of
income taxes
  
 
11
 
 
 
—
 
 
 
—
 
 
 
—
 
 
 
11
 
Foreign currency translation adjustments, net of $6 of income
taxes
  
 
—
 
 
 
12
 
 
 
—
 
 
 
—
 
 
 
12
 
Defined benefit plans, net of $16 income tax benefit
  
 
—
 
 
 
—
 
 
 
(55
) 
 
 
—
 
 
 
(55
) 
Change in fair value of derivative instruments, net of $15 income
tax benefit
  
 
—
 
 
 
—
 
 
 
—
 
 
 
(51
) 
 
 
(51
) 
Expense reclassified into operations from other comprehensive income, net of $6 and $5 income tax benefits, respectively
  
 
—
 
 
 
—
 
 
 
22
 
 
 
19
 
 
 
41
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 31, 2020
  
$
25
 
 
$
(271
) 
 
$
(220
) 
 
$
(36
) 
 
$
(502
)