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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, 2024	Dec. 31, 2023
Debt Securities held to maturity, amortized cost	$ 3,230	$ 763
Debt Securities held to maturity, estimated fair value	2,759	716
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	411
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	405
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost	2,023
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value	1,967
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	726
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value	731
Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost	139
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	129
Debt Securities, Available-for-sale, Amortized Cost	30,090	30,864
Debt securities available for sale	28,698	28,104
Residential agency
Debt Securities held to maturity, amortized cost	2,718	247
Debt Securities held to maturity, estimated fair value	2,260	223
Debt Securities, Available-for-sale, Amortized Cost	21,564	19,450
Debt securities available for sale	20,459	17,372
Commercial agency
Debt Securities held to maturity, amortized cost	512	516
Debt Securities held to maturity, estimated fair value	499	493
Debt Securities, Available-for-sale, Amortized Cost	5,135	7,807
Debt securities available for sale	4,922	7,307
Commercial non-agency
Debt Securities, Available-for-sale, Amortized Cost	92	93
Debt securities available for sale	$ 85	$ 83

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