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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 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 812 | $ 913
Debt Securities held to maturity, estimated fair value | 751 | 950
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 165 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 164 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 2,276 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 2,134 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 841 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 753 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 147 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 128 |
Debt Securities, Available-for-sale, Amortized Cost | 31,367 | 28,263
Debt securities available for sale | 27,933 | 28,481
Residential Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 289 | 370
Debt Securities held to maturity, estimated fair value | 258 | 377
Debt Securities, Available-for-sale, Amortized Cost | 19,477 | 18,873
Debt securities available for sale | 16,954 | 18,962
Residential Non-Agency [Member] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1 | 1
Debt securities available for sale | 1 | 1
Commercial Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 523 | 543
Debt Securities held to maturity, estimated fair value | 493 | 573
Debt Securities, Available-for-sale, Amortized Cost | 8,262 | 6,271
Debt securities available for sale | 7,613 | 6,373
Commercial Non Agency [Member] |  |
Debt Securities, Available-for-sale, Amortized Cost | 198 | 532
Debt securities available for sale | $ 186 | $ 536

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