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Assets and Liabilities Measured at Fair Value (Tables)
 3 Months Ended
Mar. 31, 2020
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value on Recurring Basis
The following tables summarize our assets and liabilities measured at fair value on a recurring basis as of March 31, 2020 and December 31, 2019, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
March 31, 2020
 
  
 
  
Fair Value Measurements Using
 
  
Fair Value
 
  
Quoted Prices in
Active Markets for
Identical Assets
and Liabilities
(Level 1)
 
  
Significant Other
Observable Inputs
(Level 2)
 
  
Significant
Unobservable Inputs
(Level 3)
 
Assets:
   
     
     
     
 
Investments of insurance subsidiaries:
   
     
     
     
 
Debt securities
 
$
384
 
  
$
—
 
  
$
384
 
  
$
—
 
Money market funds and other
 
 
54
 
  
 
54
 
  
 
—
 
  
 
—
 
                                 
Investments of insurance subsidiaries
 
 
438
 
  
 
54
 
  
 
384
 
  
 
—
 
Less amounts classified as current assets
 
 
(113
)
 
 
(53
)
 
 
(60
)
 
 
—
 
                                 
  
$
325
 
  
$
1
 
  
$
324
 
  
$
—
 
                                 
Liabilities:
   
     
     
     
 
Interest rate swaps (Income taxes and other liabilities)
 
$
 65
 
  
$
—
 
  
$
65
 
   $
—
 
  
December 31, 2019
 
  
 
  
Fair Value Measurements Using
 
  
Fair Value
 
  
Quoted Prices in
Active Markets for
Identical Assets
and Liabilities

(Level 1)
 
  
Significant Other
Observable Inputs
(Level 2)
 
  
Significant
Unobservable Inputs
(Level 3)
 
Assets:
   
     
     
     
 
Investments of insurance subsidiaries:
   
     
     
     
 
Debt securities
  $
377
    $
—
    $
377
    $
—
 
Money market funds and other
   
85
     
85
     
—
     
—
 
                                 
Investments of insurance subsidiaries
   
462
     
85
     
377
     
—
 
Less amounts classified as current assets
   
(147
 )    
(83
 )    
(64
 )    
—
 
                                 
   $
315
    $
2
    $
313
    $
—
 
                                 
Interest rate swaps (Other)
  $
3
    $
—
    $
3
    $
—
 
Liabilities:
   
     
     
     
 
Interest rate swaps (Income taxes and other liabilities)
  $
7
    $
—
    $
7
    $
—