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Pension and Other Postretirement Employee Benefits (OPEB) Plans - Schedule of Health Care Cost Trend Rates (Details) - OPEB costs | Dec. 31, 2023 | Dec. 31, 2022
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Assumed Health Care Cost Trend Rates-Not Medicare Eligible: |  |
Assumed Health Care Cost Trend Rates [Abstract] |  |
Health care cost trend rate assumed for next year | 7.00% | 6.80%
Rate to which the cost trend is expected to decline (the ultimate trend rate) | 4.50% | 4.50%
Health care cost trend rate assumed for next year (Vistra Plan) |  |
Assumed Health Care Cost Trend Rates [Abstract] |  |
Health care cost trend rate assumed for next year | 12.90% | 10.30%
Health care cost trend rate assumed for next year (Split-Participant Plan) |  |
Assumed Health Care Cost Trend Rates [Abstract] |  |
Health care cost trend rate assumed for next year | 12.30% | 10.00%
Rate to which the cost trend is expected to decline (the ultimate trend rate) |  |
Assumed Health Care Cost Trend Rates [Abstract] |  |
Rate to which the cost trend is expected to decline (the ultimate trend rate) | 4.50% | 4.50%

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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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- Definition Ultimate trend rate for health care cost for defined benefit postretirement plan. + 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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