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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, 2023	Dec. 31, 2022
Debt Securities held to maturity, amortized cost	$ 801	$ 812
Debt Securities held to maturity, estimated fair value	749	751
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	183
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	181
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	2,290
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2,172
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	843
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	782
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	165
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	150
Debt Securities, Available-for-sale, Amortized Cost	31,214	31,367
Debt securities available for sale	28,230	27,933
Residential Agency [Member]
Debt Securities held to maturity, amortized cost	279	289
Debt Securities held to maturity, estimated fair value	253	258
Debt Securities, Available-for-sale, Amortized Cost	19,407	19,477
Debt securities available for sale	17,165	16,954
Commercial Agency [Member]
Debt Securities held to maturity, amortized cost	522	523
Debt Securities held to maturity, estimated fair value	496	493
Debt Securities, Available-for-sale, Amortized Cost	8,192	8,262
Debt securities available for sale	7,657	7,613
Commercial Non Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	134	198
Debt securities available for sale	$ 123	$ 186

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