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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, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 1,010 | $ 1,143
Debt Securities held to maturity, estimated fair value | 1,064 | 1,215
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 316 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 319 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 1,155 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 1,191 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 770 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 792 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 107 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 110 |
Debt Securities, Available-for-sale, Amortized Cost | 28,684 | 26,092
Debt securities available for sale | 29,290 | 27,154
Residential Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 449 | 554
Debt Securities held to maturity, estimated fair value | 460 | 569
Debt Securities, Available-for-sale, Amortized Cost | 19,551 | 18,455
Debt securities available for sale | 19,860 | 19,076
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 | 561 | 589
Debt Securities held to maturity, estimated fair value | 604 | 646
Debt Securities, Available-for-sale, Amortized Cost | 6,241 | 5,659
Debt securities available for sale | 6,464 | 5,999
Commercial Non-Agency [Member] |  |
Debt Securities, Available-for-sale, Amortized Cost | 543 | 571
Debt securities available for sale | $ 553 | $ 586

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