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Investments of Insurance Subsidiaries (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
A summary of our insurance subsidiaries’ investments at March 31, 2019 and December 31, 2018 follows (dollars in millions):
                                 
 
March 31, 2019
 
 
Amortized
Cost
   
Unrealized
Amounts
   
Fair
Value
   
 
Gains
   
Losses
   
Debt securities
 
$
336
   
$
11
   
$
—
   
$
347
 
Money market funds and other
   
81
     
—
     
—
     
81
 
                                 
 
$
417
   
$
11
   
$
—
     
428
 
                                 
Amounts classified as current assets
   
     
     
     
(90
)
                                 
Investment carrying value
   
     
     
   
$
338
 
                                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                 
 
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 March 31, 2019 were as follows (dollars in millions):
                 
 
Amortized
Cost
   
Fair
Value
 
Due in one year or less
  $
3
    $
3
 
Due after one year through five years
   
64
     
65
 
Due after five years through ten years
   
201
     
209
 
Due after ten years
   
68
     
70
 
                 
  $
336
    $
347