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Assets and Liabilities Measured at Fair Value (Tables)
 12 Months Ended
Dec. 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 December 31, 2020 and 2019, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
   
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
 
  
$
—
  
 
   
December 31, 2019
  
   
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
   $ 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     $ —