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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	Sep. 30, 2025	Dec. 31, 2024
Debt Securities held to maturity, amortized cost	$ 6,661	$ 5,170
Debt Securities held to maturity, estimated fair value	5,716	4,226
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	313
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	1,926
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,897
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	1,079
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	1,061
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	73
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	71
Debt Securities, Available-for-sale, Amortized Cost	27,650	28,183
Debt securities available for sale	26,886	26,224
Residential agency
Debt Securities held to maturity, amortized cost	6,252	4,663
Debt Securities held to maturity, estimated fair value	5,315	3,734
Debt Securities, Available-for-sale, Amortized Cost	19,299	20,482
Debt securities available for sale	18,719	18,945
Commercial agency
Debt Securities held to maturity, amortized cost	409	507
Debt Securities held to maturity, estimated fair value	401	492
Debt Securities, Available-for-sale, Amortized Cost	4,865	4,389
Debt securities available for sale	4,742	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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