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Accumulated Other Comprehensive (Loss) Income (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |
Balance at beginning of period, net of tax |  | $ (99) |  | $ 211 |  | $ 65
Net unrealized holding (losses) gains arising during the period |  | (2,903) |  | (406) |  | 191
Investment securities, Less: (Benefit) provision for income taxes |  | (683) |  | (96) |  | 45
Investment securities, Change in net unrealized (losses) gains on investment securities, net of tax |  | (2,220) |  | (310) |  | 146
Balance at end of period, net of tax |  | (2,319) |  | (99) |  | 211
Cash Flow Hedges, Balance at beginning of period, net of tax |  | 55 | [1] | 155 | [1] | 34
Net cash flow hedge (losses) gains arising during the period before income taxes |  | (1,329) |  | (35) |  | 229
Cash flow hedges, Less: (Benefit) provision for income taxes |  | (313) |  | (8) |  | 56
Change in net cash flow hedge (losses) gains arising during the period, net of tax |  | (1,016) |  | (27) |  | 173
Net cash flow hedge (losses) gains recognized in interest and fees on loans before taxes |  | (25) |  | 95 |  | 70
Benefit plans, Less: (Benefit) provision for income taxes |  | (6) |  | 22 |  | 18
Reclassification adjustment for net cash flow hedge (losses) gains included in net income, net of tax |  | (19) |  | 73 |  | 52
Change in net cash flow hedge (losses) gains, net of tax |  | (997) |  | (100) |  | 121
Cash Flow Hedges, Balance at end of period, net of tax | [1] | (942) |  | 55 |  | 155
Benefit plans, Balance at beginning of period, net of tax |  | (168) |  | (302) |  | (415)
Benefit plans, Actuarial (loss) gain arising during the period |  | (415) |  | 159 |  | 128
Prior service credit arising during the period |  | 0 |  | 1 |  | 0
Actuarial gain (loss) arising during the period |  | (415) |  | 160 |  | 128
Benefit plans, Less: (Benefit) provision for income taxes |  | (98) |  | 38 |  | 31
Benefit plans, Net defined benefit pension and other postretirement adjustment arising during the period, net of tax |  | (317) |  | 122 |  | 97
Benefit plans, Amortization of actuarial net loss |  | 28 |  | 40 |  | 47
Benefit plans, Amortization of prior service credit |  | (23) |  | (25) |  | (27)
Benefit plans, Total amounts recognized in other noninterest expenses |  | 5 |  | 15 |  | 20
Benefit plans, Less: Provision for income taxes |  | 1 |  | 3 |  | 4
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax |  | 4 |  | 12 |  | 16
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax |  | (313) |  | 134 |  | 113
Benefit plans, Balance at end of period, net of tax |  | (481) |  | (168) |  | (302)
Total accumulated other comprehensive loss at end of period, net of tax |  | $ (3,742) |  | $ (212) |  | $ 64
[1] | The Corporation expects to reclassify $428 million of losses, net of tax, from accumulated other comprehensive loss to earnings over the next twelve months if interest yield curves and notional amounts remain at December 31, 2022 levels.

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- Definition Net of tax amount of the income statement impact of the reclassification adjustment for pension and other postretirement benefit plans recognized in net periodic defined benefit cost. + References No definition available. + Details
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