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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost | $ 17,918 | $ 19,541
Fair Value | 15,045 | $ 16,869
Debt securities |  |
Available-for-sale, Within one year, Amortized Cost | 306 |
Available-for-sale, After one year through five years, Amortized Cost | 1,312 |
Available-for-sale, After five years through ten years, Amortized Cost | 5,119 |
Available-for-sale, After ten years, Amortized Cost | 11,181 |
Amortized Cost | 17,918 |
Available-for-sale, Within one year, Fair Value | 306 |
Available-for-sale, After one year through five years, Fair Value | 1,292 |
Available-for-sale, After five years through ten years, Fair Value | 4,564 |
Available-for-sale, After ten years, Fair Value | 8,883 |
Fair Value | $ 15,045 |

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