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Investments of Insurance Subsidiaries (Tables)
 9 Months Ended
Sep. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
A summary of our insurance subsidiaries’ investments at September 30, 2019 and December 31, 2018 follows (dollars in millions):
 
September 30, 2019
 
  
Amortized
Cost
 
  
Unrealized
Amounts
   
Fair
Value
 
Gains
 
  
Losses
 
Debt securities
 
$
337
 
  
$
19
 
  
$
—
 
  
$
356
 
Money market funds and other
 
 
97
 
  
 
—
 
  
 
—
 
  
 
97
 
                                 
  
$
434
 
  
$
19
 
  
$
—
 
  
 
453
 
                                 
Amounts classified as current assets
 
 
 
  
 
 
  
 
 
  
 
(96
)
                                 
Investment carrying value
 
 
 
  
 
 
  
 
 
  
$
357
 
                                 
  
December 31, 2018
 
  
Amortized
Cost
 
  
Unrealized
Amounts
   
Fair
Value
 
Gains
 
  
Losses
 
Debt securities
  $
338
    $
5
    $
(2
 )   $
341
 
Money market funds and other
   
68
     
—
     
—
     
68
 
                                 
   $
406
    $
5
    $
(2
 )    
409
 
                                 
Amounts classified as current assets
   
     
     
     
(47
 )
                                 
Investment carrying value
   
     
     
    $
362
 
                                 
Schedule of Maturities of Investments
Scheduled maturities of investments in debt securities at September 30, 2019 were as follows (dollars in millions):
 
Amortized
Cost
 
  
Fair
Value
 
Due in one year or less
  $
12
    $
12
 
Due after one year through five years
   
76
     
79
 
Due after five years through ten years
   
183
     
195
 
Due after ten years
   
66
     
70
 
                 
   $
337
    $
356