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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, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	$ 828	$ 913
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(11)	(14)
Debt Securities held to maturity	817	899
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	51
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(55)	0
Debt Securities held to maturity, estimated fair value	762	950
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	31,814	28,263
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	36	493
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,724)	(275)
Available-for-sale debt securities, net carrying value	28,126	28,481
Debt securities available for sale	28,126	28,481
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,329	1,137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(128)	(7)
Available-for-sale debt securities, net carrying value	1,201	1,132
Debt securities available for sale	1,201	1,132
Federal Agency Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	801	94
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(63)	(3)
Available-for-sale debt securities, net carrying value	738	92
Debt securities available for sale	738	92
Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	2	4
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	4
Debt securities available for sale	2	4
Residential Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	301	370
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(10)	(13)
Debt Securities held to maturity	291	357
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	20
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(25)	0
Debt Securities held to maturity, estimated fair value	266	377
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	20,013	18,873
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	36	287
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,754)	(198)
Available-for-sale debt securities, net carrying value	17,295	18,962
Debt securities available for sale	17,295	18,962
Residential Non-Agency [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1	1
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	1	1
Debt securities available for sale	1	1
Commercial Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	527	543
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(1)	(1)
Debt Securities held to maturity	526	542
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	31
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(30)	0
Debt Securities held to maturity, estimated fair value	496	573
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	8,168	6,271
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	163
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(687)	(61)
Available-for-sale debt securities, net carrying value	7,481	6,373
Debt securities available for sale	7,481	6,373
Commercial Non-Agency [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	271	532
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(14)	0
Available-for-sale debt securities, net carrying value	257	536
Debt securities available for sale	257	536
Corporate and other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,229	1,351
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	36
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(78)	(6)
Available-for-sale debt securities, net carrying value	1,151	1,381
Debt securities available for sale	$ 1,151	$ 1,381

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