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Investment Securities (Fair Value of Securities Pledged and Accepted as Collateral) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Permitted by contract or custom to sell or repledge | $ 1,231 | $ 755
Permitted amount repledged to others | 1,231 | 755
Asset Pledged as Collateral |  |
Summary of Investment Holdings [Line Items] |  |
Pledged to others | $ 69,330 | $ 29,878

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