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Supplementary Financial Information - Schedule of Fair Value of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Carrying Amount | Long-term debt under the Vistra Operations Credit Facilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, fair value disclosure	$ 2,456	$ 2,519
Carrying Amount | Vistra Operations Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, fair value disclosure	11,881	9,378
Carrying Amount | Equipment Financing Agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, fair value disclosure	65	74
Fair Value | Level 2 | Long-term debt under the Vistra Operations Credit Facilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, fair value disclosure	2,500	2,486
Fair Value | Level 2 | Vistra Operations Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, fair value disclosure	11,752	8,830
Fair Value | Level 3 | Equipment Financing Agreements
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt Instrument, fair value disclosure	$ 62	$ 72

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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-Topic 470
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