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Assets and Liabilities Measured at Fair Value (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2019 and December 31, 2018, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
 
September 30, 2019
 
  
 
 
  
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
 
$
356
 
  
$
—
 
  
$
356
 
  
$
—
 
Money market funds and other
 
 
97
 
  
 
97
 
  
 
—
 
  
 
—
 
                                 
Investments of insurance subsidiaries
 
 
453
 
  
 
97
 
  
 
356
 
  
 
—
 
Less amounts classified as current assets
 
 
(96
)
 
 
(96
)
 
 
—
 
  
 
—
 
                                 
  
$
357
 
  
$
1
 
  
$
356
 
  
$
—
 
                                 
Liabilities:
   
     
     
     
 
Interest rate swaps (Income taxes and other liabilities)
  $
11
    $
—
    $
11
    $
—
 
  
December 31, 2018
 
  
 
  
Fair Value Measurements Using
 
  
Fair Value
 
  
Quoted Prices in
Active Markets for
Identical Assets
(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
    $
—