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Fair Value Measurements
6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Fair Value Measurements
12.

Fair Value Measurements

Assets and Liabilities Accounted for at Fair Value

Our assets and liabilities that are measured at fair value on a recurring basis include the following (in millions):

 

            Fair Value Measurements as of
June 30, 2017 Using
 
     Total      Quoted
Prices in
Active
Markets
(Level 1)
     Significant
Other
Observable
Inputs
(Level 2)
     Significant
Unobservable
Inputs
(Level 3)(a)
 

Assets:

           

Money market funds

   $ 37      $ 37      $      $  

Available-for-sale securities

     52               52         

Fixed-income securities

     41               41         

Redeemable preferred stock

     54                      54  
  

 

 

    

 

 

    

 

 

    

 

 

 

Total assets

   $ 184      $ 37      $ 93      $ 54  
  

 

 

    

 

 

    

 

 

    

 

 

 

 

            Fair Value Measurements as of
December 31, 2016 Using
 
     Total      Quoted
Prices in
Active
Markets
(Level 1)
     Significant
Other
Observable
Inputs
(Level 2)
     Significant
Unobservable
Inputs
(Level 3)(a)
 

Assets:

           

Money market funds

   $ 35      $ 35      $      $  

Available-for-sale securities

     46               46         

Fixed-income securities

     39               39         

Redeemable preferred stock

     54                      54  
  

 

 

    

 

 

    

 

 

    

 

 

 

Total assets

   $ 174      $ 35      $ 85      $ 54  
  

 

 

    

 

 

    

 

 

    

 

 

 

 

(a)

When available, Level 3 investments have been measured based on third-party investors’ recent or pending transactions in these securities, which are considered the best evidence of fair value. When this evidence is not available, we use other valuation techniques as appropriate and available. These valuation methodologies may include transactions in similar instruments, discounted cash flow analysis, third-party appraisals or industry multiples and public comparables. There has not been any significant change in the fair value of the redeemable preferred stock since our assessment as of December 31, 2016.

Fair Value of Debt

As of June 30, 2017 and December 31, 2016, the carrying value of our debt was approximately $9.1 billion and $9.3 billion, respectively. The estimated fair value of our debt was approximately $9.7 billion as of June 30, 2017 and December 31, 2016. The fair value of our fixed-rate debt is estimated by using a discounted cash flow approach and current market rates for similar types of instruments. The carrying value of our variable-rate debt approximates fair value due to the short-term nature of the interest rates.

 

Although we have determined the estimated fair value amounts using available market information and commonly accepted valuation methodologies, considerable judgment is required in interpreting market data to develop the estimates of fair value. Accordingly, our estimates are not necessarily indicative of the amounts that we, or holders of the instruments, could realize in a current market exchange. The use of different assumptions or estimation methodologies could have a material effect on the estimated fair values. The fair value estimates are based on Level 2 inputs of the fair value hierarchy available as of June 30, 2017 and December 31, 2016. These amounts have not been revalued since those dates, and current estimates of fair value could differ significantly from the amounts presented.