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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

    

2023

    

2022

Quoted prices in active markets (Level 1):

Cash equivalents and money market funds

 

$

327

 

$

240

Equity securities

61

37

Significant other observable inputs (Level 2):

Available-for-sale securities

 

431

360

Significant unobservable inputs (Level 3):

Redeemable preferred stock

 

 

56

Total Assets

 

$

819

$

693