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Investments of Insurance Subsidiaries (Tables)
 3 Months Ended
Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
A summary of our insurance subsidiaries’ investments at March 31, 2020 and December 31, 2019 follows (dollars in millions):
                                 
 
March 31, 2020
 
 
Amortized
Cost
 
  
Unrealized
Amounts
   
Fair
Value
 
Gains
 
  
Losses
 
Debt securities
 
$
371
 
  
$
15
 
  
$
(2
)
 
$
384
 
Money market funds and other
 
 
54
 
  
 
—
 
  
 
—
 
  
 
54
 
                                 
 
$
425
 
  
$
15
 
  
$
(2
)
 
 
438
 
                                 
Amounts classified as current assets
 
 
 
  
 
 
  
 
 
  
 
(113
)
                                 
Investment carrying value
 
 
 
  
 
 
  
 
 
  
$
325
 
                                 
 
 
 
 
                                 
 
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 March 31, 2020 were as follows (dollars in millions):
 
Amortized
Cost
 
  
Fair
Value
 
Due in one year or less
  $
9
    $
9
 
Due after one year through five years
   
100
     
103
 
Due after five years through ten years
   
188
     
195
 
Due after ten years
   
74
     
77
 
                 
   $
371
    $
384