Pension and Other Postretirement Employee Benefits (OPEB) Plans - Schedule of Defined Benefit Plan, Assumptions (Details) - Pension costs	12 Months Ended
	Dec. 31, 2024
Expected return on plan assets (Vistra Plan) | Weighted average
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	6.30%
Expected return on plan assets (Vistra Plan) | Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.90%
Expected return on plan assets (Vistra Plan) | Global equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.20%
Expected return on plan assets (Vistra Plan) | Real estate
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.80%
Expected return on plan assets (Vistra Plan) | Credit strategies
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.40%
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	6.30%
Expected return on plan assets (Dynegy Plan) | Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.50%
Expected return on plan assets (Dynegy Plan) | Global equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.20%
Expected return on plan assets (Dynegy Plan) | Real estate
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.80%
Expected return on plan assets (Dynegy Plan) | Credit strategies
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.40%
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%
Energy Harbor Plan | Weighted average
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.80%
Energy Harbor Plan | Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	4.60%
Energy Harbor Plan | Global equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.20%
Energy Harbor Plan | Real estate
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	5.80%
Energy Harbor Plan | Credit strategies
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.40%
Energy Harbor Plan | Hedge funds
Defined Benefit Plans and Other Postretirement Benefit Plans
Expected Long-Term Rate of Return	7.30%