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Pension and Other Postretirement Employee Benefits (OPEB) Plans - Schedule of Allocation of Plan Assets (Details) - Pension costs	Dec. 31, 2023
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%

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

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