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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 ($) | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair value of plan assets at January 1 |  | $ 2,499,000,000 |  |
Fair value of plan assets at December 31 |  | 2,665,000,000 | $ 2,499,000,000 |
Benefit plans, Actuarial gain (loss) arising during the period |  | 96,000,000 | (415,000,000) | $ 159,000,000
Qualified Plan |  |  |  |
Fair value of plan assets at January 1 |  | 2,508,000,000 | 3,462,000,000 |
Actual return on plan assets |  | 338,000,000 | (777,000,000) | 291,000,000
Benefits paid |  | (165,000,000) | (177,000,000) |
Fair value of plan assets at December 31 |  | 2,681,000,000 | 2,508,000,000 | 3,462,000,000
Projected benefit obligation at January 1 |  | 1,611,000,000 | 2,214,000,000 |
Service cost |  | 31,000,000 | 37,000,000 | 38,000,000
Interest cost |  | 85,000,000 | 62,000,000 | 61,000,000
Benefit plans, Actuarial gain (loss) arising during the period |  | 67,000,000 | (525,000,000) |
Projected benefit obligation at December 31 |  | 1,629,000,000 | 1,611,000,000 | 2,214,000,000
Accumulated benefit obligation |  | 1,611,000,000 | 1,598,000,000 |
Funded Status at December 31 | [1],[2] | $ 1,052,000,000 | $ 897,000,000 |
Weighted-average assumptions, discount rate, percent |  | 5.33% | 5.60% |
Weighted-average assumptions, rate of compensation increase, percent |  | 4.50% | 4.25% |
Net actuarial loss |  | $ (501,000,000) | $ (638,000,000) |
Amortization of prior service credit |  | 19,000,000 | 33,000,000 |
Balance at December 31 |  | $ (482,000,000) | $ (605,000,000) |
Qualified Plan | Minimum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 466.00% | 399.00% |
Qualified Plan | Maximum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 525.00% | 525.00% |
Non-Qualified Plan |  |  |  |
Fair value of plan assets at January 1 |  | $ 0 | $ 0 |
Actual return on plan assets |  | 0 | 0 |
Benefits paid |  | (15,000,000) | (15,000,000) |
Fair value of plan assets at December 31 |  | 0 | 0 | 0
Projected benefit obligation at January 1 |  | 163,000,000 | 207,000,000 |
Service cost |  | 2,000,000 | 2,000,000 | 2,000,000
Interest cost |  | 9,000,000 | 6,000,000 | 7,000,000
Benefit plans, Actuarial gain (loss) arising during the period |  | 10,000,000 | (37,000,000) |
Projected benefit obligation at December 31 |  | 169,000,000 | 163,000,000 | 207,000,000
Accumulated benefit obligation |  | 166,000,000 | 161,000,000 |
Funded Status at December 31 | [1],[2] | $ (169,000,000) | $ (163,000,000) |
Weighted-average assumptions, discount rate, percent |  | 5.33% | 5.60% |
Weighted-average assumptions, rate of compensation increase, percent |  | 4.50% | 4.25% |
Net actuarial loss |  | $ (52,000,000) | $ (46,000,000) |
Amortization of prior service credit |  | 29,000,000 | 38,000,000 |
Balance at December 31 |  | $ (23,000,000) | $ (8,000,000) |
Non-Qualified Plan | Minimum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 466.00% | 399.00% |
Non-Qualified Plan | Maximum |  |  |  |
Weighted-average assumptions, interest credit rating |  | 525.00% | 525.00% |
Postretirement Benefit Plan |  |  |  |
Fair value of plan assets at January 1 |  | $ 46,000,000 | $ 53,000,000 |
Actual return on plan assets |  | 1,000,000 | (4,000,000) | (1,000,000)
Benefits paid |  | (2,000,000) | (3,000,000) |
Fair value of plan assets at December 31 |  | 45,000,000 | 46,000,000 | 53,000,000
Projected benefit obligation at January 1 |  | 21,000,000 | 31,000,000 |
Service cost |  | 0 | 0 |
Interest cost |  | 1,000,000 | 1,000,000 | 1,000,000
Benefit plans, Actuarial gain (loss) arising during the period |  | (3,000,000) | (8,000,000) |
Projected benefit obligation at December 31 |  | 17,000,000 | 21,000,000 | $ 31,000,000
Accumulated benefit obligation |  | 17,000,000 | 21,000,000 |
Funded Status at December 31 | [1],[2] | $ 28,000,000 | $ 25,000,000 |
Weighted-average assumptions, discount rate, percent |  | 5.43% | 5.71% |
Net actuarial loss |  | $ (9,000,000) | $ (10,000,000) |
Amortization of prior service credit |  | 2,000,000 | 2,000,000 |
Balance at December 31 |  | $ (7,000,000) | $ (8,000,000) |
[1] | Based on projected benefit obligation for defined benefit pension plans and accumulated benefit obligation for postretirement benefit plan.
[2] | 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. n/a - not applicable

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i-k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-10A Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02)(A) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + 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 -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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