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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, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities held to maturity, amortized cost | $ 772 | $ 812
Debt Securities held to maturity, estimated fair value | 703 | 751
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 273 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 268 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 2,696 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 2,477 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 391 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 367 |
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost | 164 |
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value | 140 |
Debt Securities, Available-for-sale, Amortized Cost | 30,353 | 31,367
Debt securities available for sale | 26,228 | 27,933
Residential Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 255 | 289
Debt Securities held to maturity, estimated fair value | 219 | 258
Debt Securities, Available-for-sale, Amortized Cost | 18,802 | 19,477
Debt securities available for sale | 15,740 | 16,954
Commercial Agency [Member] |  |
Debt Securities held to maturity, amortized cost | 517 | 523
Debt Securities held to maturity, estimated fair value | 484 | 493
Debt Securities, Available-for-sale, Amortized Cost | 7,934 | 8,262
Debt securities available for sale | 7,158 | 7,613
Commercial Non Agency [Member] |  |
Debt Securities, Available-for-sale, Amortized Cost | 93 | 198
Debt securities available for sale | $ 78 | $ 186

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479130/326-30-45-1 + Details
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