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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |  |  |  |  |
Investment securities, Balance at beginning of period, net of tax |  | $ 211 |  | $ 65 |  | $ (138) |  |
Net unrealized holding (losses) gains arising during the period |  | (406) |  | 191 |  | 257 |  |
Investment securities, Less: (Benefit) provision for income taxes |  | (96) |  | 45 |  | 60 |  |
Investment securities, Net unrealized holding (losses) gains arising during period, net of tax |  | (310) |  | 146 |  | 197 |  |
Investment securities, Net realized losses included in net securities losses |  | 0 |  | 0 |  | (8) |  |
Investment securities, Less: Benefit for income taxes |  | 0 |  | 0 |  | (2) |  |
Investment securities, Reclassification adjustment for net securities losses included in net income, net of tax |  | 0 |  | 0 |  | (6) |  |
Investment securities, Change in net unrealized (losses) gains on investment securities, net of tax |  | (310) |  | 146 |  | 203 |  |
Investment securities, Balance at end of period, net of tax |  | (99) |  | 211 |  | 65 |  |
Cash flow hedges, Net (losses) gains arising during the period |  | (35) |  | 229 |  | 44 |  |
Cash flow hedges, Less: (Benefit) provision for income taxes |  | (8) |  | 56 |  | 10 |  |
Change in net cash flow hedge gains arising during the period, net of tax |  | (27) |  | 173 |  | 34 |  |
Net cash flow hedge gains included in interest and fees on loans |  | 95 |  | 70 |  | 0 |  |
Benefit plans, Less: Provision for income taxes |  | 22 |  | 18 |  | 0 |  |
Cash flow hedges, reclassification adjustment for net cash flow hedge gains included in net income, net of tax |  | 73 |  | 52 |  | 0 |  |
Change in net cash flow hedges gains, net of tax |  | (100) |  | 121 |  | 34 |  |
AOCI, Cash Flow Hedge, Cumulative Gain (Loss), after Tax |  | 55 | [1] | 155 | [1] | 34 | [1] | $ 0
Benefit plans, Balance at beginning of period, net of tax | [2] | (302) |  | (415) |  | (548) |  |
Actuarial (gain) loss | [2] | 159 |  | 128 |  | 157 |  |
Prior service (cost) credit arising during the period |  | 1 |  | 0 |  | 0 |  |
Benefit plans, Net defined benefit pension and other postretirement plans adjustment arising during the period |  | 160 |  | 128 |  | 157 |  |
Cash flow hedges, Less: Provision for income taxes | [2] | 38 |  | 31 |  | 36 |  |
Benefit plans, Net defined benefit pension and other postretirement adjustment arising during the period, net of tax | [2] | 122 |  | 97 |  | 121 |  |
Benefit plans, Amortization of actuarial net loss | [2] | 40 |  | 47 |  | 42 |  |
Benefit plans, Amortization of prior service credit |  | (25) |  | (27) |  | (27) |  |
Benefit plans, Total amounts recognized in other noninterest expenses | [2] | 15 |  | 20 |  | 15 |  |
Benefit plans, Less: Provision for income taxes | [2] | 3 |  | 4 |  | 3 |  |
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax | [2] | 12 |  | 16 |  | 12 |  |
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax | [2] | 134 |  | 113 |  | 133 |  |
Benefit plans, Balance at end of period, net of tax | [2] | (168) |  | (302) |  | (415) |  |
Total accumulated other comprehensive (loss) income at end of period, net of tax |  | $ (212) |  | $ 64 |  | $ (316) |  |
[1] | The Corporation expects to reclassify $47 million of net gains, 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, 2021 levels.
[2] | Balances at beginning and end of period, net of tax, and changes for the years ended December 31, 2020 and 2019 have been recast to reflect the retrospective application of the Corporation's election to change the accounting method for certain components of the qualified defined benefit pension plan as of January 1, 2021. Refer to Note 1 for further information.

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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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- Definition Amount, after tax, of accumulated unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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- Definition Amount, after tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=124501264&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e681-108580 + Details
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- Definition Amount, after tax, of accumulated gain (loss) on derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 + Details
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- Definition Amount, after tax and adjustment, of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 + Details
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