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Employee Benefit Plans (Reconciliations of Plan assets and the Projected Benefit Obligation, the Weighted-Average Assumptions Used to Determine Year-End Benefit Obligations, and the Amounts Recognized in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair value of plan assets at January 1 |  | $ 3,349 |  |  |  |
Fair value of plan assets at December 31 |  | 3,454 | $ 3,349 |  |  |
Actuarial (gain) loss | [1] | 159 | 128 |  | $ 157 |
Qualified Plan |  |  |  |  |  |
Fair value of plan assets at January 1 |  | 3,350 | 2,933 |  |  |
Actual return on plan assets |  | 291 | 537 | [2] | 579 | [2]
Plan participants' contributions |  | 0 | 0 |  |  |
Benefits paid |  | (179) | (120) |  |  |
Fair value of plan assets at December 31 |  | 3,462 | 3,350 |  | 2,933 |
Projected benefit obligation at January 1 |  | 2,327 | 2,131 |  |  |
Projected benefit obligation at December 31 |  | 2,214 | 2,327 |  | 2,131 |
Service cost | [3] | 38 | 32 | [2] | 31 | [2]
Interest cost |  | 61 | 70 | [2] | 80 | [2]
Actuarial (gain) loss |  | (69) | 214 |  |  |
Plan participants' contributions |  | 0 | 0 |  |  |
Plan amendments | [4] | 36 | 0 |  |  |
Accumulated benefit obligation |  | 2,199 | 2,312 |  |  |
Funded Status at December 31 | [5],[6] | $ 1,248 | $ 1,023 |  |  |
Weighted-average assumptions, discount rate, percent |  | 2.96% | 2.71% |  |  |
Weighted-average assumptions, rate of compensation increase, percent |  | 4.00% | 4.00% |  |  |
Actuarial net loss | [7] | $ (205) | $ (392) |  |  |
Prior service credit | [7] | 48 | 103 |  |  |
Balance at December 31 | [7] | $ (157) | $ (289) |  |  |
Qualified Plan | Minimum |  |  |  |  |  |
Weighted-average assumptions, interest credit rating |  | 379.00% | 379.00% |  |  |
Qualified Plan | Maximum |  |  |  |  |  |
Weighted-average assumptions, interest credit rating |  | 500.00% | 500.00% |  |  |
Non-Qualified Plan |  |  |  |  |  |
Fair value of plan assets at January 1 |  | $ 0 |  |  |  |
Benefits paid |  | (15) | $ (14) |  |  |
Fair value of plan assets at December 31 |  | 0 | 0 |  |  |
Projected benefit obligation at January 1 |  | 252 | 235 |  |  |
Projected benefit obligation at December 31 |  | 207 | 252 |  | 235 |
Service cost | [3] | 2 | 1 |  | 3 |
Interest cost |  | 7 | 8 |  | 9 |
Actuarial (gain) loss |  | (3) | 22 |  |  |
Plan participants' contributions |  | 0 | 0 |  |  |
Plan amendments | [4] | (36) | 0 |  |  |
Accumulated benefit obligation |  | 204 | 251 |  |  |
Funded Status at December 31 | [5],[6] | $ (207) | $ (252) |  |  |
Weighted-average assumptions, discount rate, percent |  | 2.96% | 2.71% |  |  |
Weighted-average assumptions, rate of compensation increase, percent |  | 4.00% | 4.00% |  |  |
Actuarial net loss | [7] | $ (92) | $ (106) |  |  |
Prior service credit | [7] | 47 | 17 |  |  |
Balance at December 31 | [7] | $ (45) | $ (89) |  |  |
Non-Qualified Plan | Minimum |  |  |  |  |  |
Weighted-average assumptions, interest credit rating |  | 379.00% | 379.00% |  |  |
Non-Qualified Plan | Maximum |  |  |  |  |  |
Weighted-average assumptions, interest credit rating |  | 500.00% | 500.00% |  |  |
Postretirement Benefit Plan |  |  |  |  |  |
Fair value of plan assets at January 1 |  | $ 57 | $ 57 |  |  |
Actual return on plan assets |  | (1) | 3 |  | 5 |
Plan participants' contributions |  | 1 | 1 |  |  |
Benefits paid |  | (4) | (4) |  |  |
Fair value of plan assets at December 31 |  | 53 | 57 |  | 57 |
Projected benefit obligation at January 1 |  | 35 | 48 |  |  |
Projected benefit obligation at December 31 |  | 31 | 35 |  | 48 |
Service cost |  | 0 | 0 |  |  |
Interest cost |  | 1 | 1 |  | $ 2 |
Actuarial (gain) loss |  | (1) | (11) |  |  |
Plan participants' contributions |  | 1 | 1 |  |  |
Plan amendments | [4] | (1) | 0 |  |  |
Accumulated benefit obligation |  | 31 | 35 |  |  |
Funded Status at December 31 | [5],[6] | $ 22 | $ 22 |  |  |
Weighted-average assumptions, discount rate, percent |  | 2.79% | 2.43% |  |  |
Healthcare cost trend rate assumed for next year |  |  | 6.00% |  |  |
Rate to which the healthcare cost trend rate is assumed to decline (the ultimate trend rate), percent |  | 4.50% | 4.50% |  | 4.50% |
Year when healthcare cost trend rate reaches the ultimate trend rate |  |  | 2027 |  |  |
Actuarial net loss | [7] | $ (11) | $ (9) |  |  |
Prior service credit | [7] | 2 | 1 |  |  |
Balance at December 31 | [7] | $ (9) | $ (8) |  |  |
[1] | 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.
[2] | Recast to reflect the retrospective application of the Corporation's election to change the accounting method for certain components of defined pension benefit credit, effective January 1, 2021. For 2020, expected return on plan assets increased $14 million and amortization of net loss was reduced by $16 million, resulting in an increase of $30 million to total other components of net benefit credit. For 2019, expected return on plan assets increased $6 million, resulting in a corresponding increase to total other components of net benefit credit.
[3] | Included in salaries and benefits expense on the Consolidated Statements of Income.
[4] | The qualified defined benefit pension plan was amended in 2021 to include a flat dollar benefit for specified participants that would otherwise have been payable from the non-qualified defined benefit pension plan, resulting in a shift in projected benefit obligation from the non-qualified plan to the qualified plan.
[5] | Based on projected benefit obligation for defined benefit pension plans and accumulated benefit obligation for postretirement benefit plan.
[6] | The Corporation recognizes the overfunded and underfunded status of the plans in accrued income and other assets and accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheets.
[7] | The qualified defined benefit pension plan for the year ending December 31, 2020 has been recast to reflect the retrospective application of the Corporation's election to change the accounting method for certain components of defined pension benefit credit, effective January 1, 2021. For further information, refer to Note 1.

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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount, before 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://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 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://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 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -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 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Weighted-average interest crediting rate used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, cash balance and other defined benefit plans with promised interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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