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Assets and Liabilities Measured at Fair Value (Tables)
 6 Months Ended
Jun. 30, 2021
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 June 30, 2021 and December 31, 2020, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
    
June 30, 2021
  
          
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
   
$
400
 
  
$
—
 
  
$
400
 
  
$
—
 
Money market funds and other
   
 
125
 
  
 
125
 
  
 
—
 
  
 
—
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Investments of insurance subsidiaries
   
 
525
 
  
 
125
 
  
 
400
 
  
 
—
 
Less amounts classified as current assets
   
 
(115
) 
  
 
(73
) 
  
 
(42
) 
  
 
—
 
    
 
 
    
 
 
    
 
 
    
 
 
  
    
$
410
 
  
$
52
 
  
$
358
 
  
$
—
 
    
 
 
    
 
 
    
 
 
    
 
 
  
Liabilities:
                                 
Interest rate swaps (Income taxes and other liabilities)
   
$
28
 
  
$
—
 
  
$
28
 
  
$
—
 
 
    
December 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
    $ 416     $ —     $ 416     $ —  
Money market funds and other
      88       88       —       —  
    
 
 
    
 
 
    
 
 
    
 
 
  
Investments of insurance subsidiaries
      504       88       416       —  
Less amounts classified as current assets
      (116 )      (87 )      (29 )      —  
    
 
 
    
 
 
    
 
 
    
 
 
  
     $ 388     $ 1     $ 387     $ —  
    
 
 
    
 
 
    
 
 
    
 
 
  
Liabilities:
                                 
Interest rate swaps (Income taxes and other liabilities)
    $ 46     $ —     $ 46     $ —