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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances |  | $ 1,300
Other Notes Payable | $ 5,300 | $ 3,200

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