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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Measurements  
Fair Value of Assets and Liabilities Measured on Recurring Basis

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2023

    

2022

Quoted prices in active markets (Level 1):

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Cash equivalents and money market funds

 

$

327

 

$

240

Equity securities

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61

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37

Significant other observable inputs (Level 2):

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Available-for-sale securities

 

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431

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360

Significant unobservable inputs (Level 3):

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Redeemable preferred stock

 

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—

 

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56

Total Assets

 

$

819

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$

693