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Fair Value Measurements
3 Months Ended
Mar. 31, 2020
Fair Value Measurements  
Fair Value Measurements

12.  Fair Value Measurements

Assets and Liabilities Accounted for at Fair Value

As of March 31, 2020, we had one liability measured on a recurring basis related to an interest rate derivative with a fair value of less than $1 million, utilizing a combination of Level 2 and Level 3 inputs. See Note 3 for further discussion. We had no liabilities measured on a recurring basis as of December 31, 2019. Our assets that are measured at fair value on a recurring basis include the following (in millions):

March 31, 

December 31, 

    

2020

    

2019

Fair Value Measurements Using:

Quoted prices in active markets (Level 1):

Cash equivalents and money market funds

 

$

3,117

 

$

3,527

Significant other observable inputs (Level 2):

Available-for-sale securities (a)

 

390

 

350

Significant unobservable inputs (Level 3):

Redeemable preferred stock (b)

 

49

 

49

Total Assets

 

$

3,556

$

3,926

(a)

Our available-for-sale securities generally mature over the next ten years.

(b)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 techniques, third-party appraisals or industry multiples and public company comparable transactions.

Fair Value of Debt

As of March 31, 2020 and December 31, 2019, the carrying value of our debt was $13.5 billion. The estimated fair value of our debt was approximately $14.3 billion and $14.5 billion as of March 31, 2020 and December 31, 2019, respectively.

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. Furthermore, the fair value of debt instruments measured as of March 31, 2020 is particularly susceptible to variability from future measurements of fair value given elevated volatility in key market factors due to the impact the COVID-19 pandemic is having on financial markets. 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 March 31, 2020 and December 31, 2019. These amounts have not been revalued since those dates, and current estimates of fair value could differ significantly from the amounts presented.