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Investment Securities (Contractual Maturity Distribution Of Debt Securities) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities available-for-sale, Amortized Cost | $ 19,541 | $ 22,045
Investment Securities, Available-for-sale | 16,869 | $ 19,012
Debt securities |  |
Available-for-sale, Within one year, Amortized Cost | 813 |
Available-for-sale, After one year through five years, Amortized Cost | 1,098 |
Available-for-sale, After five years through ten years, Amortized Cost | 5,380 |
Available-for-sale, After ten years, Amortized Cost | 12,250 |
Investment securities available-for-sale, Amortized Cost | 19,541 |
Available-for-sale, Within one year, Fair Value | 790 |
Available-for-sale, After one year through five years, Fair Value | 1,034 |
Available-for-sale, After five years through ten years, Fair Value | 4,869 |
Available-for-sale, After ten years, Fair Value | 10,176 |
Investment Securities, Available-for-sale | $ 16,869 |

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