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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, 2025 | Dec. 31, 2024
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 6,661 | $ 5,170
Debt Securities held to maturity, estimated fair value | 5,716 | 4,226
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 | 313 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 1,926 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 1,897 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 1,079 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 1,061 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 73 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 71 |
Debt Securities, Available-for-sale, Amortized Cost | 27,650 | 28,183
Debt securities available for sale | 26,886 | 26,224
Residential agency |  |
Debt Securities held to maturity, amortized cost | 6,252 | 4,663
Debt Securities held to maturity, estimated fair value | 5,315 | 3,734
Debt Securities, Available-for-sale, Amortized Cost | 19,299 | 20,482
Debt securities available for sale | 18,719 | 18,945
Commercial agency |  |
Debt Securities held to maturity, amortized cost | 409 | 507
Debt Securities held to maturity, estimated fair value | 401 | 492
Debt Securities, Available-for-sale, Amortized Cost | 4,865 | 4,389
Debt securities available for sale | 4,742 | 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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