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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 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 848 | $ 913
Debt Securities held to maturity, estimated fair value | 817 | 950
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 195 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 194 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 2,277 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 2,195 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 694 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 636 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 111 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 97 |
Debt Securities, Available-for-sale, Amortized Cost | 31,263 | 28,263
Debt securities available for sale | 29,052 | 28,481
Residential Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 316 | 370
Debt Securities held to maturity, estimated fair value | 296 | 377
Debt Securities, Available-for-sale, Amortized Cost | 20,700 | 18,873
Debt securities available for sale | 19,007 | 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 | 532 | 543
Debt Securities held to maturity, estimated fair value | 521 | 573
Debt Securities, Available-for-sale, Amortized Cost | 6,961 | 6,271
Debt securities available for sale | 6,607 | 6,373
Commercial Non-Agency [Member] |  |
Debt Securities, Available-for-sale, Amortized Cost | 324 | 532
Debt securities available for sale | $ 315 | $ 536

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