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Investments and Fair Value Measurement - Unrealized Gain (Loss) on Non-Marketable Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value Disclosures [Abstract]      
Upward adjustments $ 657 $ 908 $ 1,046
Downward adjustments (including impairment) (328) (472) (641)
Total unrealized gain (loss) for non-marketable equity securities $ 329 $ 436 $ 405