Pension and Other Postretirement Employee Benefits (OPEB) Plans - Schedule of Allocation of Plan Assets (Details) - Pension costs	Dec. 31, 2024
Expected return on plan assets (Vistra Plan) | Fixed income securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	50.00%
Expected return on plan assets (Vistra Plan) | Fixed income securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	70.00%
Expected return on plan assets (Vistra Plan) | Global equity securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	20.00%
Expected return on plan assets (Vistra Plan) | Global equity securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	28.00%
Expected return on plan assets (Vistra Plan) | Real estate | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	6.00%
Expected return on plan assets (Vistra Plan) | Real estate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	10.00%
Expected return on plan assets (Vistra Plan) | Credit strategies | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.00%
Expected return on plan assets (Vistra Plan) | Credit strategies | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	6.00%
Expected return on plan assets (Vistra Plan) | Hedge funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	2.00%
Expected return on plan assets (Vistra Plan) | Hedge funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	6.00%
Expected return on plan assets (Dynegy Plan) | Fixed income securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	40.00%
Expected return on plan assets (Dynegy Plan) | Fixed income securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	50.00%
Expected return on plan assets (Dynegy Plan) | Global equity securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	28.00%
Expected return on plan assets (Dynegy Plan) | Global equity securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	38.00%
Expected return on plan assets (Dynegy Plan) | Real estate | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	7.00%
Expected return on plan assets (Dynegy Plan) | Real estate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	15.00%
Expected return on plan assets (Dynegy Plan) | Credit strategies | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	4.00%
Expected return on plan assets (Dynegy Plan) | Credit strategies | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	8.00%
Expected return on plan assets (Dynegy Plan) | Hedge funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	4.00%
Expected return on plan assets (Dynegy Plan) | Hedge funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	8.00%
Energy Harbor Plan | Fixed income securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	45.00%
Energy Harbor Plan | Fixed income securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	55.00%
Energy Harbor Plan | Global equity securities | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	30.00%
Energy Harbor Plan | Global equity securities | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	38.00%
Energy Harbor Plan | Real estate | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	5.00%
Energy Harbor Plan | Real estate | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	10.00%
Energy Harbor Plan | Credit strategies | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	4.00%
Energy Harbor Plan | Credit strategies | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	8.00%
Energy Harbor Plan | Hedge funds | Minimum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	1.00%
Energy Harbor Plan | Hedge funds | Maximum
Defined Benefit Plan Disclosure [Line Items]
Target Allocation Ranges	5.00%