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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, 2024	Dec. 31, 2023
Debt Securities held to maturity, amortized cost	$ 741	$ 763
Debt Securities held to maturity, estimated fair value	690	716
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	329
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	323
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	2,051
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,938
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	438
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	429
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	150
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	134
Debt Securities, Available-for-sale, Amortized Cost	31,612	30,864
Debt securities available for sale	28,537	28,104
Residential agency
Debt Securities held to maturity, amortized cost	228	247
Debt Securities held to maturity, estimated fair value	200	223
Debt Securities, Available-for-sale, Amortized Cost	22,263	19,450
Debt securities available for sale	19,832	17,372
Commercial agency
Debt Securities held to maturity, amortized cost	513	516
Debt Securities held to maturity, estimated fair value	490	493
Debt Securities, Available-for-sale, Amortized Cost	6,289	7,807
Debt securities available for sale	5,800	7,307
Commercial non-agency
Debt Securities, Available-for-sale, Amortized Cost	92	93
Debt securities available for sale	$ 81	$ 83

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