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Investments of Insurance Subsidiaries
 9 Months Ended
Sep. 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 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
 
                                 
At September 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 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
 
                 
The average expected maturity of the investments in debt securities at September 30, 2019 was 5.6 years, compared to the average scheduled maturity of 10.0 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.