v3.26.1
Fair Value Measurements - Schedule of Fair Value of Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Carrying Amount | Long-term debt under the Vistra Operations Credit Facilities | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure $ 0 $ 2,417
Carrying Amount | BCOP Credit Facility | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 752 859
Carrying Amount | Vistra Zero Term Loan B Facility | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 687 687
Carrying Amount | TxEF Loan | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 171 0
Carrying Amount | Vistra Operations Senior Notes | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 17,518 12,620
Carrying Amount | Energy Harbor Revenue Bonds | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 417 416
Carrying Amount | Equipment Financing Agreements | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 50 45
Carrying Amount | Forward Repurchase Obligation | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 613 632
Fair Value | Long-term debt under the Vistra Operations Credit Facilities | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 0 2,459
Fair Value | BCOP Credit Facility | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 764 872
Fair Value | Vistra Zero Term Loan B Facility | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 694 688
Fair Value | TxEF Loan | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 172 0
Fair Value | Vistra Operations Senior Notes | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 17,704 12,955
Fair Value | Energy Harbor Revenue Bonds | Level 2    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 434 433
Fair Value | Equipment Financing Agreements | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure 50 45
Fair Value | Forward Repurchase Obligation | Level 3    
Debt Instrument [Line Items]    
Debt instrument, fair value disclosure $ 613 $ 632