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Pension and Other Postretirement Employee Benefits (OPEB) Plans - Schedule of Defined Benefit Plan, Assumptions (Details) - Pension costs	12 Months Ended
	Dec. 31, 2023
Expected return on plan assets (Vistra Plan) | Weighted average
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.90%
Expected return on plan assets (Vistra Plan) | Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.30%
Expected return on plan assets (Vistra Plan) | Global equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.40%
Expected return on plan assets (Vistra Plan) | Real estate
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.50%
Expected return on plan assets (Vistra Plan) | Credit strategies
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	6.50%
Expected return on plan assets (Vistra Plan) | Hedge funds
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.30%
Expected return on plan assets (Dynegy Plan) | Weighted average
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	6.10%
Expected return on plan assets (Dynegy Plan) | Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.10%
Expected return on plan assets (Dynegy Plan) | Global equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.40%
Expected return on plan assets (Dynegy Plan) | Real estate
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.50%
Expected return on plan assets (Dynegy Plan) | Credit strategies
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	6.50%
Expected return on plan assets (Dynegy Plan) | Hedge funds
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.30%

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- Definition

Defined Benefit Plan Assumptions Investment Strategy Expected Long-Term Return on Assets

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