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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	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 31,214	$ 31,367
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	11	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,995)	(3,435)
Available-for-sale debt securities, net carrying value	28,230	27,933
Debt securities available for sale	28,230	27,933
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	801	812
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(11)	(11)
Debt Securities held to maturity	790	801
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(41)	(50)
Debt Securities held to maturity, estimated fair value	749	751
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,307	1,310
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(102)	(123)
Available-for-sale debt securities, net carrying value	1,205	1,187
Debt securities available for sale	1,205	1,187
Federal agency securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	992	898
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(49)	(62)
Available-for-sale debt securities, net carrying value	946	836
Debt securities available for sale	946	836
US States and Political Subdivisions Debt Securities
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 [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	19,407	19,477
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(2,245)	(2,523)
Available-for-sale debt securities, net carrying value	17,165	16,954
Debt securities available for sale	17,165	16,954
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	279	289
Held To Maturity Debt Securities Gross Unrealized Gains	0	0
Held To Maturity Debt Securities Gross Unrealized Losses	(10)	(10)
Debt Securities held to maturity	269	279
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(16)	(21)
Debt Securities held to maturity, estimated fair value	253	258
Residential Non-Agency [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost		1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax		0
Available-for-sale debt securities, net carrying value		1
Debt securities available for sale		1
Commercial Agency [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	8,192	8,262
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(537)	(649)
Available-for-sale debt securities, net carrying value	7,657	7,613
Debt securities available for sale	7,657	7,613
Schedule of Held-to-maturity Securities [Line Items]
Debt Securities held to maturity, amortized cost	522	523
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	521	522
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain	0	0
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss	(25)	(29)
Debt Securities held to maturity, estimated fair value	496	493
Commercial Non Agency [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	134	198
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(11)	(12)
Available-for-sale debt securities, net carrying value	123	186
Debt securities available for sale	123	186
Corporate and other debt securities [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	1,180	1,219
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3	1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(51)	(66)
Available-for-sale debt securities, net carrying value	1,132	1,154
Debt securities available for sale	$ 1,132	$ 1,154

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