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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 | Jun. 30, 2022 | Dec. 31, 2021
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Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities held to maturity, amortized cost | $ 848 | $ 913
Held To Maturity Debt Securities Gross Unrealized Gains | 0 | 0
Held To Maturity Debt Securities Gross Unrealized Losses | (12) | (14)
Debt Securities held to maturity | 836 | 899
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain | 0 | 51
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss | (19) | 0
Debt Securities held to maturity, estimated fair value | 817 | 950
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 31,263 | 28,263
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 47 | 493
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (2,258) | (275)
Available-for-sale debt securities, net carrying value | 29,052 | 28,481
Debt securities available for sale | 29,052 | 28,481
US Treasury Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,329 | 1,137
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6 | 2
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (83) | (7)
Available-for-sale debt securities, net carrying value | 1,252 | 1,132
Debt securities available for sale | 1,252 | 1,132
Federal Agency Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 711 | 94
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 1
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (28) | (3)
Available-for-sale debt securities, net carrying value | 683 | 92
Debt securities available for sale | 683 | 92
Obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 3 | 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 | 3 | 4
Debt securities available for sale | 3 | 4
Residential Agency [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities held to maturity, amortized cost | 316 | 370
Held To Maturity Debt Securities Gross Unrealized Gains | 0 | 0
Held To Maturity Debt Securities Gross Unrealized Losses | (11) | (13)
Debt Securities held to maturity | 305 | 357
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain | 0 | 20
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss | (9) | 0
Debt Securities held to maturity, estimated fair value | 296 | 377
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 20,700 | 18,873
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 38 | 287
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (1,731) | (198)
Available-for-sale debt securities, net carrying value | 19,007 | 18,962
Debt securities available for sale | 19,007 | 18,962
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 | 0 | 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale debt securities, net carrying value | 1 | 1
Debt securities available for sale | 1 | 1
Commercial Agency [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Debt Securities held to maturity, amortized cost | 532 | 543
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 | 531 | 542
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain | 0 | 31
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss | (10) | 0
Debt Securities held to maturity, estimated fair value | 521 | 573
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 6,961 | 6,271
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2 | 163
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (356) | (61)
Available-for-sale debt securities, net carrying value | 6,607 | 6,373
Debt securities available for sale | 6,607 | 6,373
Commercial Non-Agency [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 324 | 532
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (9) | 0
Available-for-sale debt securities, net carrying value | 315 | 536
Debt securities available for sale | 315 | 536
Corporate and other debt securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Debt Securities, Available-for-sale, Amortized Cost | 1,234 | 1,351
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1 | 36
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | (51) | (6)
Available-for-sale debt securities, net carrying value | 1,184 | 1,381
Debt securities available for sale | $ 1,184 | $ 1,381

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