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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	Jun. 30, 2021	Dec. 31, 2020
Debt Securities held to maturity, amortized cost	$ 1,010	$ 1,143
Debt Securities held to maturity, estimated fair value	1,064	1,215
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	316
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	319
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,155
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,191
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	770
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	792
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	107
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	110
Debt Securities, Available-for-sale, Amortized Cost	28,684	26,092
Debt securities available for sale	29,290	27,154
Residential Agency [Member]
Debt Securities held to maturity, amortized cost	449	554
Debt Securities held to maturity, estimated fair value	460	569
Debt Securities, Available-for-sale, Amortized Cost	19,551	18,455
Debt securities available for sale	19,860	19,076
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	561	589
Debt Securities held to maturity, estimated fair value	604	646
Debt Securities, Available-for-sale, Amortized Cost	6,241	5,659
Debt securities available for sale	6,464	5,999
Commercial Non-Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	543	571
Debt securities available for sale	$ 553	$ 586

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