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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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