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Debt Securities (Schedule Of Amortized Cost, Gross Unrealized Gains And Losses, And Estimated Fair Value Of Securities Available For Sale And Securities Held To Maturity) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 27,650	$ 28,183
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	234	26
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(998)	(1,985)
Available-for-sale debt securities, net carrying value	26,886	26,224
Debt securities available for sale	26,886	26,224
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	6,661	5,170
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(892)	(743)
Debt Securities held to maturity	5,769	4,427
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	18	0
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(71)	(201)
Debt Securities held to maturity, estimated fair value	5,716	4,226
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2,316	2,088
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	9	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(59)	(87)
Available-for-sale debt securities, net carrying value	2,266	2,003
Debt securities available for sale	2,266	2,003
Federal agency securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	614	460
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(9)	(17)
Available-for-sale debt securities, net carrying value	610	444
Debt securities available for sale	610	444
Obligations of states and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale debt securities, net carrying value	2	2
Debt securities available for sale	2	2
Residential agency
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	19,299	20,482
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	185	20
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(765)	(1,557)
Available-for-sale debt securities, net carrying value	18,719	18,945
Debt securities available for sale	18,719	18,945
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	6,252	4,663
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(892)	(743)
Debt Securities held to maturity	5,360	3,920
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	18	0
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(63)	(186)
Debt Securities held to maturity, estimated fair value	5,315	3,734
Commercial agency
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,865	4,389
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	29	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(152)	(300)
Available-for-sale debt securities, net carrying value	4,742	4,090
Debt securities available for sale	4,742	4,090
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	409	507
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	0	0
Debt Securities held to maturity	409	507
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(8)	(15)
Debt Securities held to maturity, estimated fair value	401	492
Commercial non-agency
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	92	92
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(9)	(10)
Available-for-sale debt securities, net carrying value	83	82
Debt securities available for sale	83	82
Corporate and other debt securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	462	670
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(4)	(14)
Available-for-sale debt securities, net carrying value	464	658
Debt securities available for sale	$ 464	$ 658

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