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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, 2021 | Dec. 31, 2020
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities held to maturity, amortized cost |  | $ 1,010 | $ 1,143
Held To Maturity Debt Securities Gross Unrealized Gains | [1] | 0 | 0
Held To Maturity Debt Securities Gross Unrealized Losses | [1] | (17) | (21)
Debt Securities held to maturity |  | 993 | 1,122
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain |  | 71 | 93
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss |  | 0 | 0
Debt Securities held to maturity, estimated fair value |  | 1,064 | 1,215
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 28,684 | 26,092
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 750 | 1,072
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (144) | (10)
Available-for-sale debt securities, net carrying value |  | 29,290 | 27,154
Debt securities available for sale |  | 29,290 | 27,154
US Treasury Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 732 | 178
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 5 | 5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 | 0
Available-for-sale debt securities, net carrying value |  | 737 | 183
Debt securities available for sale |  | 737 | 183
Federal Agency Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 98 | 102
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 2 | 3
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (1) | 0
Available-for-sale debt securities, net carrying value |  | 99 | 105
Debt securities available for sale |  | 99 | 105
Residential Agency [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Debt Securities held to maturity, amortized cost |  | 449 | 554
Held To Maturity Debt Securities Gross Unrealized Gains | [1] | 0 | 0
Held To Maturity Debt Securities Gross Unrealized Losses | [1] | (15) | (19)
Debt Securities held to maturity |  | 434 | 535
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain |  | 26 | 34
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss |  | 0 | 0
Debt Securities held to maturity, estimated fair value |  | 460 | 569
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 19,551 | 18,455
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 420 | 625
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (111) | (4)
Available-for-sale debt securities, net carrying value |  | 19,860 | 19,076
Debt securities available for sale |  | 19,860 | 19,076
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 |  | 561 | 589
Held To Maturity Debt Securities Gross Unrealized Gains | [1] | 0 | 0
Held To Maturity Debt Securities Gross Unrealized Losses | [1] | (2) | (2)
Debt Securities held to maturity |  | 559 | 587
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Gain |  | 45 | 59
Held-to-maturity Debt Securities, Accumulated Unrecognized Holding Loss |  | 0 | 0
Debt Securities held to maturity, estimated fair value |  | 604 | 646
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 6,241 | 5,659
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 254 | 346
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (31) | (6)
Available-for-sale debt securities, net carrying value |  | 6,464 | 5,999
Debt securities available for sale |  | 6,464 | 5,999
Commercial Non-Agency [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 543 | 571
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 10 | 15
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 | 0
Available-for-sale debt securities, net carrying value |  | 553 | 586
Debt securities available for sale |  | 553 | 586
Corporate and other debt securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 1,518 | 1,126
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax |  | 59 | 78
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | (1) | 0
Available-for-sale debt securities, net carrying value |  | 1,576 | 1,204
Debt securities available for sale |  | $ 1,576 | $ 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.

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