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Investments and Fair Value Measurement - Change in Equity Securities (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Fair Value Disclosures [Abstract]    
Initial cost basis $ 2,030 $ 1,727
Upward adjustments 2,611 1,960
Downward adjustments (including impairment) (1,442) (1,113)
Total carrying value at the end of the period $ 3,199 $ 2,574