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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	Jun. 30, 2022	Dec. 31, 2021
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	$ 848	$ 913
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(12)	(14)
Debt Securities held to maturity	836	899
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	51
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(19)	0
Debt Securities held to maturity, estimated fair value	817	950
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	31,263	28,263
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	47	493
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,258)	(275)
Available-for-sale debt securities, net carrying value	29,052	28,481
Debt securities available for sale	29,052	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	6	2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(83)	(7)
Available-for-sale debt securities, net carrying value	1,252	1,132
Debt securities available for sale	1,252	1,132
Federal Agency Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	711	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	(28)	(3)
Available-for-sale debt securities, net carrying value	683	92
Debt securities available for sale	683	92
Obligations
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3	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	3	4
Debt securities available for sale	3	4
Residential Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	316	370
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(11)	(13)
Debt Securities held to maturity	305	357
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	20
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(9)	0
Debt Securities held to maturity, estimated fair value	296	377
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	20,700	18,873
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	38	287
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,731)	(198)
Available-for-sale debt securities, net carrying value	19,007	18,962
Debt securities available for sale	19,007	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	532	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	531	542
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	31
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(10)	0
Debt Securities held to maturity, estimated fair value	521	573
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	6,961	6,271
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	163
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(356)	(61)
Available-for-sale debt securities, net carrying value	6,607	6,373
Debt securities available for sale	6,607	6,373
Commercial Non-Agency [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	324	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	(9)	0
Available-for-sale debt securities, net carrying value	315	536
Debt securities available for sale	315	536
Corporate and other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,234	1,351
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1	36
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(51)	(6)
Available-for-sale debt securities, net carrying value	1,184	1,381
Debt securities available for sale	$ 1,184	$ 1,381

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