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Investments (Narrative) (Details) $ in Billions | Dec. 31, 2024 USD ($) positions | Dec. 31, 2023 USD ($)
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Investments [Abstract] |  |
Equity Securities, FV-NI and without Readily Determinable Fair Value | $ 4.9 | $ 4.9
Equity Method Investments | $ 3.8 | $ 1.4
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | positions | 34,000 |
Total number of security positions | 43,000 |

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