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Fair Value Measurements
3 Months Ended
Mar. 31, 2019
Fair Value Measurements  
Fair Value Measurements

13.  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):

 

 

 

 

 

 

 

 

 

March 31, 

 

December 31, 

 

    

2019

    

2018

Fair Value Measurements Using:

 

 

 

 

 

 

Quoted prices in active markets (Level 1):

 

 

 

 

 

 

Money market funds

 

$

163

 

$

70

 

 

 

163

 

 

70

 

 

 

 

 

 

 

Significant other observable inputs (Level 2):

 

 

 

 

 

 

Available-for-sale securities

 

 

258

 

 

288

 

 

 

258

 

 

288

 

 

 

 

 

 

 

Significant unobservable inputs (Level 3):

 

 

 

 

 

 

Redeemable preferred stock (a)

 

 

46

 

 

66

 

 

 

46

 

 

66

 

 

 

 

 

 

 

Total Assets

 

$

467

 

$

424


(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 techniques, third-party appraisals or industry multiples and public company comparable transactions. In the first quarter of 2019, we redeemed our preferred stock received in conjunction with the 2014 sale of our Puerto Rico operations for $17 million. At the time of redemption, the value of redeemable preferred stock was $20 million, resulting in a $3 million loss on investment.

Fair Value of Debt

As of March 31, 2019 and December 31, 2018, the carrying value of our debt was $10.4 billion and $10.0 billion, respectively. The estimated fair value of our debt was approximately  $10.7 billion and $10.1 billion as of March 31, 2019 and December 31, 2018, 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. 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, 2019 and December 31, 2018. These amounts have not been revalued since those dates, and current estimates of fair value could differ significantly from the amounts presented.