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Assets and Liabilities Measured at Fair Value (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities 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 December 31, 2022 and 2021, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
    
2022
  
          
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
   
 
96
 
  
 
96
 
  
 
—
 
   
 
—
 
    
 
 
    
 
 
    
 
 
     
 
 
  
Investments of insurance subsidiaries
   
 
473
 
  
 
96
 
  
 
377
 
   
 
—
 
Less amounts classified as current assets
   
 
(92
) 
  
 
(92
) 
  
 
—
 
   
 
—
 
    
 
 
    
 
 
    
 
 
     
 
 
  
    
$
                381
 
  
$
4
 
  
$
                377
 
   
$
—
 
    
 
 
    
 
 
    
 
 
     
 
 
  
 
 
    
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
    $ 416     $ —     $ 416      $ —  
Money market funds and other
      125       125       —        —  
    
 
 
    
 
 
    
 
 
     
 
 
  
Investments of insurance subsidiaries
      541       125       416        —  
Less amounts classified as current assets
      (103 )      (103 )      —        —  
    
 
 
    
 
 
    
 
 
     
 
 
  
     $                 438     $ 22     $                 416      $ —  
    
 
 
    
 
 
    
 
 
     
 
 
  
Liabilities:
                                  
Interest rate swap (Other accrued expenses)
    $ 8     $ —     $ 8      $ —