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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, 2021	Dec. 31, 2020
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost		$ 1,010	$ 1,143
Held To Maturity Debt Securities Gross Unrealized Gains	[1]	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	[1]	(17)	(21)
Debt Securities held to maturity		993	1,122
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain		71	93
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss		0	0
Debt Securities held to maturity, estimated fair value		1,064	1,215
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		28,684	26,092
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		750	1,072
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(144)	(10)
Available-for-sale debt securities, net carrying value		29,290	27,154
Debt securities available for sale		29,290	27,154
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		732	178
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		5	5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0	0
Available-for-sale debt securities, net carrying value		737	183
Debt securities available for sale		737	183
Federal Agency Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		98	102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		2	3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(1)	0
Available-for-sale debt securities, net carrying value		99	105
Debt securities available for sale		99	105
Residential Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost		449	554
Held To Maturity Debt Securities Gross Unrealized Gains	[1]	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	[1]	(15)	(19)
Debt Securities held to maturity		434	535
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain		26	34
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss		0	0
Debt Securities held to maturity, estimated fair value		460	569
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		19,551	18,455
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		420	625
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(111)	(4)
Available-for-sale debt securities, net carrying value		19,860	19,076
Debt securities available for sale		19,860	19,076
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		561	589
Held To Maturity Debt Securities Gross Unrealized Gains	[1]	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	[1]	(2)	(2)
Debt Securities held to maturity		559	587
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain		45	59
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss		0	0
Debt Securities held to maturity, estimated fair value		604	646
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		6,241	5,659
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		254	346
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(31)	(6)
Available-for-sale debt securities, net carrying value		6,464	5,999
Debt securities available for sale		6,464	5,999
Commercial Non-Agency [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		543	571
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		10	15
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0	0
Available-for-sale debt securities, net carrying value		553	586
Debt securities available for sale		553	586
Corporate and other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		1,518	1,126
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		59	78
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		(1)	0
Available-for-sale debt securities, net carrying value		1,576	1,204
Debt securities available for sale		$ 1,576	$ 1,204
[1] The gross unrealized losses recognized in OCI on securities held to maturity resulted from a transfer of securities available for sale to held to maturity in the second quarter of 2013.

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