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Fair Value Measurements
9 Months Ended
Sep. 30, 2021
Fair Value Measurements  
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):

September 30, 

December 31, 

    

2021

    

2020

Fair Value Measurements Using:

Quoted prices in active markets (Level 1):

Cash equivalents and money market funds (a)

 

$

48

 

$

530

Equity securities

16

Significant other observable inputs (Level 2):

Available-for-sale securities (b)

 

413

 

390

Significant unobservable inputs (Level 3):

Redeemable preferred stock (c)

 

49

 

49

Total Assets

 

$

526

$

969

(a)The decrease is primarily due to the use of available cash to retire certain high-coupon senior notes in May 2021, which is discussed further in Note 3.
(b)Our available-for-sale securities primarily relate to debt securities with maturities over the next nine years.
(c)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.

See Note 8 for information related to the nonrecurring fair value measurement of assets and liabilities acquired in connection with our acquisition of Advanced Disposal. See Note 9 for information related to our nonrecurring fair value measurements and the impact of impairments.

Fair Value of Debt

As of September 30, 2021 and December 31, 2020, the carrying value of our debt was $13.0 billion and $13.8 billion, respectively. The estimated fair value of our debt was approximately $13.8 billion and $15.2 billion as of September 30, 2021 and December 31, 2020, respectively. The decrease in the fair value of debt is primarily related to net repayments of $809 million during 2021 and the replacement of debt balances with a relatively high fair value to carrying value ratio with new debt with a fair value that approximates carrying value (refer to Note 3 for additional information) and increases in current market rates of our senior notes.

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 September 30, 2021 and December 31, 2020. These amounts have not been revalued since those dates, and current estimates of fair value could differ significantly from the amounts presented.