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Investments (Narrative) (Details) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Investments [Abstract] |  |
Equity Securities, FV-NI and without Readily Determinable Fair Value | $ 5,600 | $ 4,900
Equity Method Investments | $ 3,500 | $ 3,800
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 25,000 |
Total number of security positions | 41,000 |

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