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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, 2025	Dec. 31, 2024
Debt Securities held to maturity, amortized cost	$ 6,070	$ 5,170
Debt Securities held to maturity, estimated fair value	5,063	4,226
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	374
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	369
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,979
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,922
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	835
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	817
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	76
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	73
Debt Securities, Available-for-sale, Amortized Cost	27,265	28,183
Debt securities available for sale	25,942	26,224
Residential agency
Debt Securities held to maturity, amortized cost	5,565	4,663
Debt Securities held to maturity, estimated fair value	4,571	3,734
Debt Securities, Available-for-sale, Amortized Cost	19,600	20,482
Debt securities available for sale	18,583	18,945
Commercial agency
Debt Securities held to maturity, amortized cost	505	507
Debt Securities held to maturity, estimated fair value	492	492
Debt Securities, Available-for-sale, Amortized Cost	4,309	4,389
Debt securities available for sale	4,095	4,090
Commercial non-agency
Debt Securities, Available-for-sale, Amortized Cost	92	92
Debt securities available for sale	$ 83	$ 82

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