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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 | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 3,230 | $ 763
Debt Securities held to maturity, estimated fair value | 2,759 | 716
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 411 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 405 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 2,023 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 1,967 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 726 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 731 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 139 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 129 |
Debt Securities, Available-for-sale, Amortized Cost | 30,090 | 30,864
Debt securities available for sale | 28,698 | 28,104
Residential agency |  |
Debt Securities held to maturity, amortized cost | 2,718 | 247
Debt Securities held to maturity, estimated fair value | 2,260 | 223
Debt Securities, Available-for-sale, Amortized Cost | 21,564 | 19,450
Debt securities available for sale | 20,459 | 17,372
Commercial agency |  |
Debt Securities held to maturity, amortized cost | 512 | 516
Debt Securities held to maturity, estimated fair value | 499 | 493
Debt Securities, Available-for-sale, Amortized Cost | 5,135 | 7,807
Debt securities available for sale | 4,922 | 7,307
Commercial non-agency |  |
Debt Securities, Available-for-sale, Amortized Cost | 92 | 93
Debt securities available for sale | $ 85 | $ 83

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