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Investments of Insurance Subsidiaries (Tables)
 3 Months Ended
Mar. 31, 2021
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investments
A summary of our insurance subsidiaries’ investments at March 31, 2021 and December 31, 2020 follows (dollars in millions):
 
 
  
March 31, 2021
 
 
  
Amortized

Cost
 
  
Unrealized

Amounts
 
  
Fair

Value
 
 
  
Gains
 
  
Losses
 
Debt securities
  
$
376
 
  
$
22
 
  
$
(1
) 
  
$
397
 
Money market funds and other
  
 
104
 
  
 
—
 
  
 
—
 
  
 
104
 
 
  
$
480
 
  
$
22
 
  
$
(1
) 
  
 
501
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Amounts classified as current assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
(108
) 
Investment carrying value
  
 
 
 
  
 
 
 
  
 
 
 
  
$
393
 
                               
 
 
  
 
  
December 31, 2020
 
 
   
Amortized

Cost
 
  
Unrealized

Amounts
 
  
Fair

Value
 
 
  
Gains
 
  
Losses
 
Debt securities
  
$
384
 
  
$
32
 
  
$
—
 
  
$
416
 
Money market funds and other
  
 
88
 
  
 
—
 
  
 
—
 
  
 
88
 
 
  
$
472
 
  
$
32
 
  
$
—
 
  
 
504
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Amounts classified as current assets
  
 
 
 
  
 
 
 
  
 
 
 
  
 
(116
) 
Investment carrying value
  
 
 
 
  
 
 
 
  
 
 
 
  
$
388
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
Schedule of Maturities of Investments
Scheduled maturities of investments in debt securities at March 31, 2021 were as follows (dollars in millions):
 
 
  
Amortized

Cost
 
  
Fair

Value
 
Due in one year or less
  
$
4
 
  
$
4
 
Due after one year through five years
  
 
144
 
  
 
152
 
Due after five years through ten years
  
 
157
 
  
 
167
 
Due after ten years
  
 
71
 
  
 
74
 
 
  
$
376
 
  
$
397