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Benefit Plans - Assumptions (Details) | 12 Months Ended | 36 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2024
Weighted average assumptions used to determine net periodic benefit cost |  |  |  |
Defined Benefit Plan, Tax Status [Extensible Enumeration] |  |  |  | Qualified Plan [Member]
Pension Plan [Member] |  |  |  |
Weighted average assumptions used to determine net periodic benefit cost |  |  |  |
Expected long term return on plan assets (as a percent) | 4.75% | 4.75% | 3.05% |
Postretirement Health Coverage [Member] |  |  |  |
Assumed healthcare cost trend rates (reaches ultimate trend rate in 2026) |  |  |  |
Healthcare cost trend rate assumed for next year (as a percent) | 7.00% | 6.00% | 6.00% | 7.00%
Rate to which the cost trend is assumed to decline (the ultimate trend rate) (as a percent) | 5.00% | 5.00% | 5.00% | 5.00%
Qualified Plan [Member] | Pension Plan [Member] |  |  |  |
Weighted average assumptions were used to determine benefit obligations |  |  |  |
Discount rate (as a percent) | 5.59% | 5.22% |  | 5.59%
Weighted average assumptions used to determine net periodic benefit cost |  |  |  |
Discount rate (as a percent) | 5.22% | 5.57% | 2.77% |
Nonqualified Plan [Member] | Pension Plan [Member] |  |  |  |
Weighted average assumptions were used to determine benefit obligations |  |  |  |
Discount rate (as a percent) | 5.59% | 5.22% |  | 5.59%
Weighted average assumptions used to determine net periodic benefit cost |  |  |  |
Discount rate (as a percent) | 5.22% | 5.57% | 2.77% |
Nonqualified Plan [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |
Weighted average assumptions were used to determine benefit obligations |  |  |  |
Discount rate (as a percent) | 5.59% | 5.22% |  | 5.59%
Weighted average assumptions used to determine net periodic benefit cost |  |  |  |
Discount rate (as a percent) | 5.22% | 5.57% | 2.77% |

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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 -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Assumed rate, for next fiscal year, based on annual change in cost of health care cost benefits used to measure expected cost of benefits covered by defined benefit postretirement plan. Factors include, but are not limited to, estimate of health care inflation, change in health care utilization or delivery pattern, technological advances, and change in health status of participant. Excludes factors for change in composition of plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (l) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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