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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Balance at beginning of period, net of tax | $ (2,319) | $ (99) | $ 211
Net unrealized gains (losses) arising during the period | 361 | (2,903) | (406)
Investment Securities, Less: Provision (benefit) for income taxes | 85 | (683) | (96)
Investment securities, Change in net unrealized losses on investment securities, net of tax | 276 | (2,220) | (310)
Balance at end of period, net of tax | (2,043) | (2,319) | (99)
Cash Flow Hedges, Balance at beginning of period, net of tax | (942) | 55 | 155
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net | 34 | (1,329) | (35)
Reclassification of loss related to de-designation of derivatives to other noninterest income | (195) | 0 | 0
Cash flow hedges, Less: Benefit for income taxes | (38) | (313) | (8)
Change in net cash flow hedge (losses) gains arising during the period, net of tax | (123) | (1,016) | (27)
Net cash flow hedge (losses) gains recognized in interest and fees on loans before taxes | (576) | (25) | 95
Amortization of unrealized losses related to de-designated derivatives | (26) | 0 | 0
Benefit plans, Less: (Benefit) provision for income taxes | (142) | (6) | 22
Reclassification adjustment for net cash flow hedge (losses) gains included in net income, net of tax | (460) | (19) | 73
Change in net cash flow hedges gains, net of tax | 337 | (997) | (100)
Cash Flow Hedges, Balance at end of period, net of tax | (605) | (942) | 55
Benefit plans, Balance at beginning of period, net of tax | (481) | (168) | (302)
Benefit plans, Actuarial gain (loss) arising during the period | 96 | (415) | 159
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), before Tax | 0 | 0 | 1
Benefit plans, Actuarial loss arising during the period | 96 | (415) | 160
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax | 25 | (98) | 38
Benefit plans, Net defined benefit pension and other postretirement adjustment arising during the period, net of tax | 71 | (317) | 122
Benefit plans, Amortization of actuarial net loss | 36 | 28 | 40
Benefit plans, Amortization of prior service (credit) cost | (23) | (23) | (25)
Benefit plans, Total amounts recognized in employee benefits expense | 13 | 5 | 15
Benefit plans, Less: Provision for income taxes | 3 | 1 | 3
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax | 10 | 4 | 12
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax | 81 | (313) | 134
Benefit plans, Balance at end of period, net of tax | (400) | (481) | (168)
Total accumulated other comprehensive loss at end of period, net of tax | $ (3,048) | $ (3,742) | $ (212)

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