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Assets and Liabilities Measured at Fair Value (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2021 and 2020, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
   
December 31, 2021
  
   
Fair Value
    
Fair Value Measurements Using
  
   
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
 
  
$
—
 
 
   
December 31, 2020
  
   
Fair Value
    
Fair Value Measurements Using
  
   
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     $ —