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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
Dec. 31, 2022
Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 31,367 $ 28,263
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 1 493
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (3,435) (275)
Available-for-sale debt securities, net carrying value 27,933 28,481
Debt securities available for sale 27,933 28,481
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 812 913
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (11) (14)
Debt Securities held to maturity 801 899
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 0 51
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (50) 0
Debt Securities held to maturity, estimated fair value 751 950
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,310 1,137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 0 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (123) (7)
Available-for-sale debt securities, net carrying value 1,187 1,132
Debt securities available for sale 1,187 1,132
Federal agency securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 898 94
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 0 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (62) (3)
Available-for-sale debt securities, net carrying value 836 92
Debt securities available for sale 836 92
US States and Political Subdivisions Debt Securities    
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]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 19,477 18,873
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 0 287
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (2,523) (198)
Available-for-sale debt securities, net carrying value 16,954 18,962
Debt securities available for sale 16,954 18,962
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 289 370
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (10) (13)
Debt Securities held to maturity 279 357
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 0 20
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (21) 0
Debt Securities held to maturity, estimated fair value 258 377
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 [1] 0 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] 0 0
Available-for-sale debt securities, net carrying value 1 1
Debt securities available for sale 1 1
Commercial Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 8,262 6,271
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 0 163
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (649) (61)
Available-for-sale debt securities, net carrying value 7,613 6,373
Debt securities available for sale 7,613 6,373
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 523 543
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (1) (1)
Debt Securities held to maturity 522 542
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 0 31
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss (29) 0
Debt Securities held to maturity, estimated fair value 493 573
Commercial Non Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 198 532
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 0 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (12) 0
Available-for-sale debt securities, net carrying value 186 536
Debt securities available for sale 186 536
Corporate and other debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,219 1,351
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 1 36
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (66) (6)
Available-for-sale debt securities, net carrying value 1,154 1,381
Debt securities available for sale $ 1,154 $ 1,381
[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.