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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, 2022	Dec. 31, 2021
Debt Securities held to maturity, amortized cost	$ 828	$ 913
Debt Securities held to maturity, estimated fair value	762	950
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	214
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	211
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	2,251
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	2,094
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	788
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	698
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	108
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	89
Debt Securities, Available-for-sale, Amortized Cost	31,814	28,263
Debt securities available for sale	28,126	28,481
Residential Agency [Member]
Debt Securities held to maturity, amortized cost	301	370
Debt Securities held to maturity, estimated fair value	266	377
Debt Securities, Available-for-sale, Amortized Cost	20,013	18,873
Debt securities available for sale	17,295	18,962
Residential Non-Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	1	1
Debt securities available for sale	1	1
Commercial Agency [Member]
Debt Securities held to maturity, amortized cost	527	543
Debt Securities held to maturity, estimated fair value	496	573
Debt Securities, Available-for-sale, Amortized Cost	8,168	6,271
Debt securities available for sale	7,481	6,373
Commercial Non-Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	271	532
Debt securities available for sale	$ 257	$ 536

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