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Investment Securities (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract] |  |  |  |
Net unsettled investment purchases |  | $ 1,200 | $ 100 |
Investment securities, allowance for credit loss |  | 91 | 92 |
Pretax loss from derivatives |  | 275 | 293 |
Securities available-for-sale | $ 3,800 |  |  |
Loss on available for sale securities sold | $ 497 | $ 502 | $ 2 | $ 18

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