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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Fair value of plan assets at January 1 |  | $ 3,454 |  |
Fair value of plan assets at December 31 |  | 2,499 | $ 3,454 |
Actuarial (loss) gain arising during the period |  | (415) | 159 | $ 128
Qualified Plan |  |  |  |
Fair value of plan assets at January 1 |  | 3,462 | 3,350 |
Actual return on plan assets |  | (777) | 291 | 537
Plan participants' contributions |  | 0 | 0 |
Benefits paid |  | (177) | (179) |
Fair value of plan assets at December 31 |  | 2,508 | 3,462 | 3,350
Projected benefit obligation at January 1 |  | 2,214 | 2,327 |
Service cost | [1] | 37 | 38 | 32
Interest cost |  | 62 | 61 | 70
Actuarial (loss) gain arising during the period |  | (525) | (69) |
Plan participants' contributions |  | 0 | 0 |
Plan amendments | [2] | 0 | 36 |
Projected benefit obligation at December 31 |  | 1,611 | 2,214 | 2,327
Accumulated benefit obligation |  | 1,598 | 2,199 |
Funded Status at December 31 | [3],[4] | $ 897 | $ 1,248 |
Weighted-average assumptions, discount rate, percent |  | 5.60% | 2.96% |
Weighted-average assumptions, rate of compensation increase, percent |  | 4.25% | 4.00% |
Net actuarial loss |  | $ (638) | $ (205) |
Amortization of prior service credit |  | 33 | 48 |
Balance at December 31 |  | $ (605) | $ (157) |
Qualified Plan | Minimum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 399.00% | 379.00% |
Qualified Plan | Maximum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 525.00% | 500.00% |
Non-Qualified Plan |  |  |  |
Fair value of plan assets at January 1 |  | $ 0 | $ 0 |
Actual return on plan assets |  | 0 | 0 |
Plan participants' contributions |  | 0 | 0 |
Benefits paid |  | (15) | (15) |
Fair value of plan assets at December 31 |  | 0 | 0 | 0
Projected benefit obligation at January 1 |  | 207 | 252 |
Service cost | [1] | 2 | 2 | 1
Interest cost |  | 6 | 7 | 8
Actuarial (loss) gain arising during the period |  | (37) | (3) |
Plan participants' contributions |  | 0 | 0 |
Plan amendments | [2] | 0 | (36) |
Projected benefit obligation at December 31 |  | 163 | 207 | 252
Accumulated benefit obligation |  | 161 | 204 |
Funded Status at December 31 | [3],[4] | $ (163) | $ (207) |
Weighted-average assumptions, discount rate, percent |  | 5.60% | 2.96% |
Weighted-average assumptions, rate of compensation increase, percent |  | 4.25% | 4.00% |
Net actuarial loss |  | $ (46) | $ (92) |
Amortization of prior service credit |  | 38 | 47 |
Balance at December 31 |  | $ (8) | $ (45) |
Non-Qualified Plan | Minimum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 399.00% | 379.00% |
Non-Qualified Plan | Maximum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 525.00% | 500.00% |
Postretirement Benefit Plan |  |  |  |
Fair value of plan assets at January 1 |  | $ 53 | $ 57 |
Actual return on plan assets |  | (4) | (1) | 3
Plan participants' contributions |  | 0 | 1 |
Benefits paid |  | (3) | (4) |
Fair value of plan assets at December 31 |  | 46 | 53 | 57
Projected benefit obligation at January 1 |  | 31 | 35 |
Service cost |  | 0 | 0 |
Interest cost |  | 1 | 1 | 1
Actuarial (loss) gain arising during the period |  | (8) | (1) |
Plan participants' contributions |  | 0 | 1 |
Plan amendments | [2] | 0 | (1) |
Projected benefit obligation at December 31 |  | 21 | 31 | $ 35
Accumulated benefit obligation |  | 21 | 31 |
Funded Status at December 31 | [3],[4] | $ 25 | $ 22 |
Weighted-average assumptions, discount rate, percent |  | 5.71% | 2.79% |
Net actuarial loss |  | $ (10) | $ (11) |
Amortization of prior service credit |  | 2 | 2 |
Balance at December 31 |  | $ (8) | $ (9) |
[1] | Included in salaries and benefits expense on the Consolidated Statements of Income.
[2] | 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.
[3] | Based on projected benefit obligation for defined benefit pension plans and accumulated benefit obligation for postretirement benefit plan.
[4] | 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.

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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 https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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