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Investment Securities (Fair Value of Securities Pledged and Accepted as Collateral) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Permitted by contract or custom to sell or repledge | $ 2,003 | $ 1,231
Permitted amount repledged to others | 2,003 | 1,231
Asset Pledged as Collateral |  |
Summary of Investment Holdings [Line Items] |  |
Debt securities, pledged to others | $ 61,378 | $ 69,330

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