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Supplementary Financial Information - Schedule of Fair Value of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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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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