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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Investment securities, Balance at beginning of period, net of tax |  | $ (99) | $ 211 |
Net unrealized losses arising during the period |  | (2,977) | (280) |
Investment securities, Less: Benefit for income taxes |  | (701) | (66) |
Investment securities, Change in net unrealized losses on investment securities, net of tax |  | (2,276) | (214) |
Investment securities, Balance at end of period, net of tax |  | (2,375) | (3) |
Cash flow hedges, Balance at beginning of period, net of tax |  | 55 | 155 |
Cash flow hedges, Net losses arising during the period |  | (1,397) | (13) |
Cash flow hedges, Less: Benefit for income taxes |  | (329) | (3) |
Change in net cash flow hedge (losses) gains arising during the period, net of tax |  | (1,068) | (10) |
Net cash flow hedge gains included in interest and fees on loans |  | 45 | 72 |
Cash flow hedges, Less: Provision for income taxes |  | 11 | 16 |
Cash flow hedges, reclassification adjustment for net cash flow hedge gains included in net income, net of tax |  | 34 | 56 |
Change in net cash flow hedge (losses) gains, net of tax |  | (1,102) | (66) |
Cash flow hedges, Balance at end of period, net of tax | [1] | (1,047) | 89 |
Benefit plans, Balance at beginning of period, net of tax |  | (168) | (302) |
Benefit plans, Amortization of actuarial net loss |  | 21 | 30 |
Benefit plans, Amortization of prior service credit |  | (18) | (19) |
Benefit plans, Amounts recognized in other noninterest expenses |  | 3 | 11 |
Benefit plans, Less: Provision for income taxes |  | 0 | 2 |
Benefit plans, Adjustment for amounts recognized as components of net periodic benefit cost during the period, net of tax |  | 3 | 9 |
Benefit plans, Change in defined benefit pension and other postretirement plans adjustment, net of tax |  | 3 | 9 |
Benefit plans, Balance at end of period, net of tax |  | (165) | (293) |
Total accumulated other comprehensive loss income at end of period, net of tax |  | $ (3,587) | $ (207) | $ (212)
[1] | The Corporation expects to reclassify $342 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 September 30, 2022 levels.

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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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + 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 https://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 https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=126734703&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 https://asc.fasb.org/extlink&oid=126968391&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 https://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 https://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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e681-108580 + Details
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- Definition Amount, before tax and adjustment, of unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes 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 (e) -URI https://asc.fasb.org/extlink&oid=126968391&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 https://asc.fasb.org/extlink&oid=126968391&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27357-111563 + Details
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