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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	Dec. 31, 2024	Dec. 31, 2023
Debt Securities held to maturity, amortized cost	$ 5,170	$ 763
Debt Securities held to maturity, estimated fair value	4,226	716
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	330
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	326
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	2,009
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,931
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	743
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	726
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	138
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	124
Debt Securities, Available-for-sale, Amortized Cost	28,183	30,864
Debt securities available for sale	26,224	28,104
Residential agency
Debt Securities held to maturity, amortized cost	4,663	247
Debt Securities held to maturity, estimated fair value	3,734	223
Debt Securities, Available-for-sale, Amortized Cost	20,482	19,450
Debt securities available for sale	18,945	17,372
Commercial agency
Debt Securities held to maturity, amortized cost	507	516
Debt Securities held to maturity, estimated fair value	492	493
Debt Securities, Available-for-sale, Amortized Cost	4,389	7,807
Debt securities available for sale	4,090	7,307
Commercial non-agency
Debt Securities, Available-for-sale, Amortized Cost	92	93
Debt securities available for sale	$ 82	$ 83

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