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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, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 6,070 | $ 5,170
Debt Securities held to maturity, estimated fair value | 5,063 | 4,226
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 374 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 369 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 1,979 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 1,922 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 835 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 817 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 76 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 73 |
Debt Securities, Available-for-sale, Amortized Cost | 27,265 | 28,183
Debt securities available for sale | 25,942 | 26,224
Residential agency |  |
Debt Securities held to maturity, amortized cost | 5,565 | 4,663
Debt Securities held to maturity, estimated fair value | 4,571 | 3,734
Debt Securities, Available-for-sale, Amortized Cost | 19,600 | 20,482
Debt securities available for sale | 18,583 | 18,945
Commercial agency |  |
Debt Securities held to maturity, amortized cost | 505 | 507
Debt Securities held to maturity, estimated fair value | 492 | 492
Debt Securities, Available-for-sale, Amortized Cost | 4,309 | 4,389
Debt securities available for sale | 4,095 | 4,090
Commercial non-agency |  |
Debt Securities, Available-for-sale, Amortized Cost | 92 | 92
Debt securities available for sale | $ 83 | $ 82

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