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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	Jun. 30, 2023	Dec. 31, 2022
Debt Securities held to maturity, amortized cost	$ 787	$ 812
Debt Securities held to maturity, estimated fair value	727	751
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	246
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	242
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	2,723
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2,519
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	329
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	314
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	145
Debt Securities, Available-for-sale, Amortized Cost	30,624	31,367
Debt securities available for sale	27,296	27,933
Residential Agency [Member]
Debt Securities held to maturity, amortized cost	267	289
Debt Securities held to maturity, estimated fair value	238	258
Debt Securities, Available-for-sale, Amortized Cost	19,005	19,477
Debt securities available for sale	16,570	16,954
Commercial Agency [Member]
Debt Securities held to maturity, amortized cost	520	523
Debt Securities held to maturity, estimated fair value	489	493
Debt Securities, Available-for-sale, Amortized Cost	8,063	8,262
Debt securities available for sale	7,425	7,613
Commercial Non Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	94	198
Debt securities available for sale	$ 81	$ 186

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