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Employee Benefit Plans - Schedule of Changes in Projected Benefit Obligations, Plan Assets and Funded Status (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Change in plan assets |  |  |
Plan assets at beginning of period | $ 1,404 |  |
Plan assets at end of period | 1,589 | $ 1,404 |
Reported in Consolidated Balance Sheets |  |  |
Pension assets | 474 | 343 |
Retirement Plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of period | 1,115 | 1,056 |
Projected benefit obligation of acquired plans | 0 | 389 |
Service cost | 9 | 14 | $ 15
Interest cost | 61 | 43 | 30
Actuarial loss (gain) | 50 | (324) |
Benefits paid | (66) | (63) |
Plan termination | 0 | 0 |
Benefit obligation at end of period | 1,169 | 1,115 | 1,056
Change in plan assets |  |  |
Plan assets at beginning of period | 1,404 | 1,345 |
Fair value of plan assets of acquired plans | 0 | 386 |
Actual return (loss) on plan assets | 245 | (270) |
Employer contributions | 6 | 0 |
Benefits paid | (66) | (57) |
Plan assets at end of period | 1,589 | 1,404 | 1,345
Funded status at December 31 | 420 | 289 |
Information for Retirement Plans with a benefit obligation in excess of plan assets |  |  |
Projected and accumulated benefit obligations | 54 | 54 |
Reported in Consolidated Balance Sheets |  |  |
Net funded status of Retirement Plans | 420 | 289 |
Retirement Plans | Other Assets |  |  |
Reported in Consolidated Balance Sheets |  |  |
Pension assets | 474 | 343 |
Retirement Plans | Other Liabilities |  |  |
Reported in Consolidated Balance Sheets |  |  |
Unfunded Supplemental and Executive Retirement Plans (other liabilities) | (54) | (54) |
Postretirement Plans |  |  |
Change in benefit obligation |  |  |
Benefit obligation at beginning of period | 0 | 0 |
Projected benefit obligation of acquired plans | 0 | 28 |
Service cost | 0 | 0 |
Interest cost | 0 | 0 |
Actuarial loss (gain) | 0 | 0 |
Benefits paid | 0 | (1) |
Plan termination | 0 | (27) |
Benefit obligation at end of period | 0 | 0 | 0
Change in plan assets |  |  |
Plan assets at beginning of period | 0 | 0 |
Fair value of plan assets of acquired plans | 0 | 0 |
Actual return (loss) on plan assets | 0 | 0 |
Employer contributions | 0 | 0 |
Benefits paid | 0 | 0 |
Plan assets at end of period | 0 | 0 | $ 0
Funded status at December 31 | 0 | 0 |
Information for Retirement Plans with a benefit obligation in excess of plan assets |  |  |
Projected and accumulated benefit obligations | 0 | 0 |
Reported in Consolidated Balance Sheets |  |  |
Net funded status of Retirement Plans | 0 | 0 |
Postretirement Plans | Other Assets |  |  |
Reported in Consolidated Balance Sheets |  |  |
Pension assets | 0 | 0 |
Postretirement Plans | Other Liabilities |  |  |
Reported in Consolidated Balance Sheets |  |  |
Unfunded Supplemental and Executive Retirement Plans (other liabilities) | $ 0 | $ 0 |

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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -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 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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