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Investments - Unrealized Gains (Losses) Included in the Carrying Value of Measurement Alternative Investments and Marketable Securities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Upward adjustments | $ 25 | $ 3 | $ 31 | $ 10
Downward adjustments (including impairment) | (2) | (2) | (32) | (6)
Unrealized gains (losses), net | $ 14 | $ (61) | $ 11 | $ 75

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- Definition Amount of unrealized gain (loss) on investment in marketable security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 + Details
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