v3.20.4
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, 2020
Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 26,092 $ 22,332
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 1,072 344
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (10) (70)
Available-for-sale debt securities, net carrying value 27,154 22,606
Debt securities available for sale 27,154 22,606
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 1,143 1,361
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (21) (29)
Debt Securities held to maturity 1,122 1,332
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 93 42
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss 0 (2)
Debt Securities held to maturity, estimated fair value 1,215 1,372
US Treasury Securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 178 180
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 5 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] 0 0
Available-for-sale debt securities, net carrying value 183 182
Debt securities available for sale 183 182
Federal agency securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 102 42
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 3 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] 0 0
Available-for-sale debt securities, net carrying value 105 43
Debt securities available for sale 105 43
Residential Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 18,455 15,336
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 625 218
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (4) (38)
Available-for-sale debt securities, net carrying value 19,076 15,516
Debt securities available for sale 19,076 15,516
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 554 736
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (19) (26)
Debt Securities held to maturity 535 710
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 34 22
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss 0 0
Debt Securities held to maturity, estimated fair value 569 732
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 5,659 4,720
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 346 77
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] (6) (31)
Available-for-sale debt securities, net carrying value 5,999 4,766
Debt securities available for sale 5,999 4,766
Schedule of Held-to-maturity Securities [Line Items]    
Debt Securities held to maturity, amortized cost 589 625
Held To Maturity Debt Securities Gross Unrealized Gains [1] 0 0
Held To Maturity Debt Securities Gross Unrealized Losses [1] (2) (3)
Debt Securities held to maturity 587 622
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain 59 20
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss 0 (2)
Debt Securities held to maturity, estimated fair value 646 640
Commercial Non Agency [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 571 639
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 15 8
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] 0 0
Available-for-sale debt securities, net carrying value 586 647
Debt securities available for sale 586 647
Corporate and other debt securities [Member]    
Debt Securities, Available-for-sale [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 1,126 1,414
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax [1] 78 38
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax [1] 0 (1)
Available-for-sale debt securities, net carrying value 1,204 1,451
Debt securities available for sale $ 1,204 $ 1,451
[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.