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Assets and Liabilities Measured at Fair Value (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
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
 
  
$
—
 
                                 
 
December 31, 2018
 
 
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
  $
341
    $
 —
     $
341
    $
—
  
Money market funds and other
   
68
     
68
     
—
      
—
  
                                 
Investments of insurance subsidiaries
   
409
     
68
     
341
     
—
  
Less amounts classified as current assets
   
(47
 )    
(47
 )    
—
      
—
  
                                 
  $
362
    $
21
    $
341
    $
—
  
                                 
Interest rate swaps (Other)
  $
63
    $
—
     $
63
    $
—