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Investments of Insurance Subsidiaries
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Investments of Insurance Subsidiaries
NOTE 5 — INVESTMENTS OF INSURANCE SUBSIDIARIES
A summary of our insurance subsidiaries’ investments at June 30, 2019 and December 31, 2018 follows (dollars in millions):
                                 
 
June 30, 2019
 
 
Amortized
Cost
   
Unrealized
Amounts
   
Fair
Value
   
 
Gains
   
Losses
   
Debt securities
 
$
334
   
$
17
   
$
—
   
$
351
 
Money market funds and other
   
104
     
—
     
—
     
104
 
                                 
 
$
438
   
$
17
   
$
—
     
455
 
                                 
Amounts classified as current assets
   
     
     
     
(113
)
                                 
Investment carrying value
   
     
     
   
$
342
 
                                 
 
 
 
                                 
 
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
 
                                 
 
 
 
At June 30, 2019 and December 31, 2018, the investments of our insurance subsidiaries were classified as
“available-for-sale.”
Changes in temporary unrealized gains and losses are recorded as adjustments to other comprehensive income (loss).
Scheduled maturities of investments in debt securities at June 30, 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
   
74
     
77
 
Due after five years through ten years
   
192
     
203
 
Due after ten years
   
65
     
68
 
                 
  $
334
    $
351
 
                 
 
 
 
The average expected maturity of the investments in debt securities at June 30, 2019 was 5.8 years, compared to the average scheduled maturity of 10.1 years. Expected and scheduled maturities may differ because the issuers of certain securities have the right to call, prepay or otherwise redeem such obligations prior to their scheduled maturity date.