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Assets and Liabilities Measured at Fair Value (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2017 and 2016, aggregated by the level in the fair value hierarchy within which those measurements fall (dollars in millions):

 

     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:

          

States and municipalities 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      $ —    

 

     December 31, 2016  
     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:

         

States and municipalities debt securities

    $ 353     $ —       $ 347     $ 6  

Money market funds and other

      32       32       —         —    
  

 

 

    

 

 

    

 

 

    

 

 

  

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     $ —