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Assets and Liabilities Measured at Fair Value (Tables)
 6 Months Ended
Jun. 30, 2018
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, 2018 and December 31, 2017, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):

 

     June 30, 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

      118       118       —        —  
  

 

 

    

 

 

    

 

 

     

 

 

  

Investments of insurance subsidiaries

      459       118       341        —  

Less amounts classified as current assets

      (45 )      (45 )      —        —  
  

 

 

    

 

 

    

 

 

     

 

 

  
   $ 414       73     $ 341      $ —  
  

 

 

    

 

 

    

 

 

     

 

 

  

Interest rate swaps (Other)

    $ 98     $ —     $ 98      $ —  
     December 31, 2017  
           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

    $ 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      $ —