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Assets and Liabilities Measured at Fair Value (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Assets and Liabilities 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 June 30, 2017 and December 31, 2016, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):

 

     June 30, 2017  
           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:

         

States and municipalities

    $ 378     $ —     $ 378     $ —  

Money market funds

      20       20       —       —  
  

 

 

    

 

 

    

 

 

    

 

 

  
     398       20       378       —  

Equity securities

      3       3       —       —  
  

 

 

    

 

 

    

 

 

    

 

 

  

Investments of insurance subsidiaries

      401       23       378       —  

Less amounts classified as current assets

      (49 )      (20 )      (29 )      —  
  

 

 

    

 

 

    

 

 

    

 

 

  
   $ 352     $ 3     $ 349     $ —  
  

 

 

    

 

 

    

 

 

    

 

 

  

Interest rate swaps (Other)

    $ 29     $ —     $ 29     $ —  

Liabilities:

         

Interest rate swaps (Income taxes and other liabilities)

    $ 5     $ —     $ 5     $ —  
     December 31, 2016  
           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:

         

States and municipalities

    $ 353     $ —     $ 347     $ 6  

Money market funds

      28       28       —       —  
  

 

 

    

 

 

    

 

 

    

 

 

  
     381       28       347       6  

Equity securities

      4       4       —       —  
  

 

 

    

 

 

    

 

 

    

 

 

  

Investments of insurance subsidiaries

      385       32       347       6  

Less amounts classified as current assets

      (49 )      (28 )      (21 )      —  
  

 

 

    

 

 

    

 

 

    

 

 

  
   $ 336     $ 4     $ 326     $ 6  
  

 

 

    

 

 

    

 

 

    

 

 

  

Interest rate swaps (Other)

    $ 31     $ —     $ 31     $ —  

Liabilities:

         

Interest rate swaps (Income taxes and other liabilities)

    $ 12     $ —     $ 12     $  —