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Investments of Insurance Subsidiaries (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
A summary of our insurance subsidiaries’ investments at June 30, 2020 and December 31, 2019 follows (dollars in millions):
 
 
  
June 30, 2020
 
 
  
Amortized
Cost
 
  
Unrealized
Amounts
 
  
Fair
Value
 
 
  
Gains
 
  
Losses
 
Debt securities
  
$
380
 
  
$
30
 
  
$
—
 
  
$
410
 
Money market funds and other
  
 
59
 
  
 
—
 
  
 
—
 
  
 
59
 
  
 
 
     
 
 
     
 
 
     
 
 
  
  
$
439
 
  
$
30
 
  
$
—
 
  
 
469
 
  
 
 
     
 
 
     
 
 
     
Amounts classified as current assets
  
  
  
  
 
(105
) 
           
 
 
  
Investment carrying value
  
  
  
  
$
364
 
           
 
 
  
 
 
  
December 31, 2019
 
 
  
Amortized
Cost
 
  
Unrealized
Amounts
 
  
Fair
Value
 
 
  
Gains
 
  
Losses
 
Debt securities
  
$
359
 
  
$
18
 
  
$
—
 
  
$
377
 
Money market funds and other
  
 
85
 
  
 
—
 
  
 
—
 
  
 
85
 
  
 
 
     
 
 
     
 
 
     
 
 
  
  
$
444
 
  
$
18
 
  
$
—
 
  
 
462
 
  
 
 
     
 
 
     
 
 
     
Amounts classified as current assets
  
  
  
  
 
(147
) 
           
 
 
  
Investment carrying value
  
  
  
  
$
315
 
           
 
 
  
Schedule of Maturities of Investments
Scheduled maturities of investments in debt securities at June 30, 2020 were as follows (dollars in millions):
 
 
  
Amortized
Cost
 
  
Fair
Value
 
Due in one year or less
  
$
14
 
  
$
14
 
Due after one year through five years
  
 
114
 
  
 
122
 
Due after five years through ten years
  
 
180
 
  
 
197
 
Due after ten years
  
 
72
 
  
 
77
 
  
 
 
     
 
 
  
  
$
380
 
  
$
410