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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
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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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