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Accounting Policies and Supplemental Disclosures - Other Income (Expense), Net (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Accounting Policies [Abstract] |  |  |  |  |
Marketable equity securities valuation gains (losses) | $ 220 |  | $ (117) | $ 470 | $ (1,800)
Equity warrant valuation gains (losses) | 441 |  | 80 | 653 | (421)
Reclassification adjustments for gains (losses) on available-for-sale debt securities | 2,307 | $ 3,300 | 0 | 5,592 | (5)
Upward adjustments relating to equity investments in private companies | 7,226 |  | 2 | 7,312 | 13
Foreign currency gains (losses) | 1 |  | 17 | 69 | (195)
Other, net | (9) |  | (9) | (44) | (310)
Other income (expense), net | $ 10,186 |  | $ (27) | $ 14,052 | $ (2,718)

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