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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, 2024	Dec. 31, 2023
Debt Securities held to maturity, amortized cost	$ 751	$ 763
Debt Securities held to maturity, estimated fair value	701	716
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	367
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	360
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,851
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,729
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	457
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	448
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	151
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	135
Debt Securities, Available-for-sale, Amortized Cost	30,909	30,864
Debt securities available for sale	27,881	28,104
Residential Agency [Member]
Debt Securities held to maturity, amortized cost	237	247
Debt Securities held to maturity, estimated fair value	211	223
Debt Securities, Available-for-sale, Amortized Cost	20,686	19,450
Debt securities available for sale	18,350	17,372
Commercial Agency [Member]
Debt Securities held to maturity, amortized cost	514	516
Debt Securities held to maturity, estimated fair value	490	493
Debt Securities, Available-for-sale, Amortized Cost	7,304	7,807
Debt securities available for sale	6,777	7,307
Commercial Non Agency [Member]
Debt Securities, Available-for-sale, Amortized Cost	93	93
Debt securities available for sale	$ 82	$ 83

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-Topic 944
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