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Investments (Narrative) (Details) $ in Millions | Mar. 31, 2026 USD ($) | Dec. 31, 2025 USD ($)
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Investments [Abstract] |  |
Equity Securities, FV-NI and without Readily Determinable Fair Value | $ 5,500 | $ 5,500
Equity Method Investments | $ 3,900 | 3,800
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 31,000 |
Total number of security positions | 42,000 |
Equity Securities without Readily Determinable Fair Value, Amount | $ 3,500 | 3,300
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Cumulative Amount | $ 933 | $ 846

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