v3.22.0.1
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, 2021
Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 28,263 $ 26,092
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 493 1,072
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (275) (10)
Available-for-sale debt securities, net carrying value 28,481 27,154
Debt securities available for sale 28,481 27,154
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 913 1,143
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (14) (21)
Debt Securities held to maturity 899 1,122
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 51 93
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss 0 0
Debt Securities held to maturity, estimated fair value 950 1,215
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,137 178
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 2 5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (7) 0
Available-for-sale debt securities, net carrying value 1,132 183
Debt securities available for sale 1,132 183
Federal agency securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 94 102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 1 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (3) 0
Available-for-sale debt securities, net carrying value 92 105
Debt securities available for sale 92 105
US States and Political Subdivisions Debt Securities    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 4  
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 4  
Debt securities available for sale 4  
Residential Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 18,873 18,455
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 287 625
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (198) (4)
Available-for-sale debt securities, net carrying value 18,962 19,076
Debt securities available for sale 18,962 19,076
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 370 554
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (13) (19)
Debt Securities held to maturity 357 535
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 20 34
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss 0 0
Debt Securities held to maturity, estimated fair value 377 569
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 6,271 5,659
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 163 346
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (61) (6)
Available-for-sale debt securities, net carrying value 6,373 5,999
Debt securities available for sale 6,373 5,999
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 543 589
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (1) (2)
Debt Securities held to maturity 542 587
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 31 59
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss 0 0
Debt Securities held to maturity, estimated fair value 573 646
Commercial Non Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 532 571
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 4 15
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] 0 0
Available-for-sale debt securities, net carrying value 536 586
Debt securities available for sale 536 586
Corporate and other debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,351 1,126
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 36 78
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (6) 0
Available-for-sale debt securities, net carrying value 1,381 1,204
Debt securities available for sale $ 1,381 $ 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.