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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2024
Fair Value Measurements  
Fair Value of Assets and Liabilities Measured on Recurring Basis

    

2024

    

2023

Quoted prices in active markets (Level 1):

Cash equivalents and money market funds

 

$

56

 

$

327

Equity securities

70

61

Significant other observable inputs (Level 2):

Available-for-sale securities

 

445

431

Total assets measured at fair value

$

571

$

819