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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
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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.

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