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Assets and Liabilities Measured at Fair Value (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 and 2017, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):

 

     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      $ —    

 

     December 31, 2017  
     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

    $ 371     $ —       $ 371      $ —    

Money market funds and other

      101       101       —          —    
  

 

 

    

 

 

    

 

 

     

 

 

  

Investments of insurance subsidiaries

      472       101       371        —    

Less amounts classified as current assets

      (54 )      (54 )      —          —    
  

 

 

    

 

 

    

 

 

     

 

 

  
   $ 418     $ 47     $ 371      $ —    
  

 

 

    

 

 

    

 

 

     

 

 

  

Interest rate swaps (Other)

    $ 50     $ —       $ 50      $ —