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Assets and Liabilities Measured at Fair Value (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Schedule of Assets Measured at Fair Value on Recurring Basis
The following tables summarize our assets measured at fair value on a recurring basis as of June 30, 2019 and December 31, 2018, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):
                                 
 
June 30, 2019
 
 
   
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)
 
Investments of insurance subsidiaries:
   
     
     
     
 
Debt securities
 
$
351
   
$
—
   
$
351
   
$
—
 
Money market funds and other
   
104
     
104
     
—
     
—
 
                                 
Investments of insurance subsidiaries
   
455
     
104
     
351
     
—
 
Less amounts classified as current assets
   
(113
)
   
(103
)
   
(10
)
   
—
 
                                 
 
$
342
     
1
   
$
341
   
$
—
 
                                 
 
 
 
 
 
 
 
 
 
                                 
 
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)
 
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
    $
—