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Debt Securities (Schedule Of Cost And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity By Contractual Maturity) (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 801 | $ 812
Debt Securities held to maturity, estimated fair value | 749 | 751
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 183 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 181 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 2,290 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 2,172 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 843 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 782 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 165 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 150 |
Debt Securities, Available-for-sale, Amortized Cost | 31,214 | 31,367
Debt securities available for sale | 28,230 | 27,933
Residential Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 279 | 289
Debt Securities held to maturity, estimated fair value | 253 | 258
Debt Securities, Available-for-sale, Amortized Cost | 19,407 | 19,477
Debt securities available for sale | 17,165 | 16,954
Commercial Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 522 | 523
Debt Securities held to maturity, estimated fair value | 496 | 493
Debt Securities, Available-for-sale, Amortized Cost | 8,192 | 8,262
Debt securities available for sale | 7,657 | 7,613
Commercial Non Agency [Member] |  |
Debt Securities, Available-for-sale, Amortized Cost | 134 | 198
Debt securities available for sale | $ 123 | $ 186

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