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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |
Investment Securities, Balance at beginning of period, net of tax | $ (2,043) | $ (2,319) | $ (99)
Net unrealized holding (losses) gains arising during the period | (182) | 361 | (2,903)
Investment Securities, Less: (Benefit) provision for income taxes | (43) | 85 | (683)
Net unrealized holding (losses) gains arising during period, net of tax | (139) | 276 | (2,220)
Net realized losses included in net securities losses | 19 | 0 | 0
Investment Securities, Less: Benefit for income taxes | 4 | 0 | 0
Reclassification adjustment for net securities losses included in net income, net of tax | 15 | 0 | 0
Change in net unrealized losses on investment securities, net of tax | (154) | 276 | (2,220)
Investment Securities, Balance at end of period, net of tax | (2,197) | (2,043) | (2,319)
Cash Flow Hedges, Balance at beginning of period, net of tax | (605) | (942) | 55
Net cash flow hedge (losses) gains arising during the period | (624) | 34 | (1,329)
Reclassification of loss related to de-designation of derivatives to other noninterest income | 0 | (195) | 0
Cash Flow Hedges, Less: Benefit for income taxes | (181) | (38) | (313)
Change in net cash flow hedge losses arising during the period, net of tax | (443) | (123) | (1,016)
Net cash flow losses included in interest and fees on loans | (629) | (576) | (25)
Amortization of unrealized losses related to de-designated derivatives | (8) | (26) | 0
Cash Flow Hedges, Less: Benefit for income taxes | (185) | (142) | (6)
Reclassification adjustment for net cash flow hedge losses included in net income, net of tax | (452) | (460) | (19)
Change in net cash flow hedge losses, net of tax | 9 | 337 | (997)
Cash Flow Hedges, Balance at end of period, net of tax | (596) | (605) | (942)
Benefit plans, Balance at beginning of period, net of tax | (400) | (481) | (168)
Benefit plans, Actuarial loss arising during the period | 35 | 96 | (415)
Benefit plans, Less: Provision (benefit) for income taxes | 8 | 25 | (98)
Benefit plans, Net defined benefit pension and other postretirement adjustment arising during the period, net of tax | 27 | 71 | (317)
Benefit plans, Amortization of actuarial net loss | 27 | 36 | 28
Benefit plans, Amortization of prior service (credit) cost | (22) | (23) | (23)
Benefit plans, Total amounts recognized in employee benefits expense | 5 | 13 | 5
Benefit plans, Less: Provision for income taxes | 0 | 3 | 1
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax | 5 | 10 | 4
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax | 32 | 81 | (313)
Benefit plans, Balance at end of period, net of tax | (368) | (400) | (481)
Total accumulated other comprehensive loss at end of period, net of tax | $ (3,161) | $ (3,048) | $ (3,742)
Cash flow hedge loss to be reclassified within 12 months | 198 million |  |

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