v3.26.1
Debt, Credit Facilities, and Financings - Schedule of Long-Term Debt Instruments (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Apr. 30, 2026
Jan. 31, 2026
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 19,595     $ 17,043  
Total other long-term debt 50     46  
Unamortized debt premiums, discounts and issuance costs (169)     (153)  
Less amounts due currently (1,876)     (1,201)  
Total long-term debt less amounts due currently $ 17,719     15,842  
Bridge Loans          
Debt Instrument [Line Items]          
Debt instrument, interest rate, stated percentage 1.625%        
Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 17,650     12,700  
Energy Harbor Revenue Bonds          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently 431     431  
Vistra Operations Credit Facilities, Term Loan B-3 Facility | Line of Credit          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently 0     2,450  
BCOP Credit Facility | Bridge Loans          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently 261     367 $ 367
BCOP Credit Facility | Construction / Term Loans          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently 503     505  
Vistra Zero Credit Facility, Term Loan B Facility due April 30, 2031 | Line of Credit          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently 697     697  
Texas Energy Fund (TxEF) Loan, due June 18, 2046 | TxEF Loan          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently 172     0  
5.050% Senior Notes, due December 30, 2026 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 500     500  
Debt instrument, interest rate, stated percentage 5.05%        
3.700% Senior Notes, due January 30, 2027 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 800     800  
Debt instrument, interest rate, stated percentage 3.70%        
5.625% Senior Notes, due February 15, 2027 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 0     1,300  
Debt instrument, interest rate, stated percentage 5.625% 5.625%      
5.000% Senior Notes, due July 31, 2027 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,300     1,300  
Debt instrument, interest rate, stated percentage 5.00%        
4.300% Senior Notes, due October 15, 2028 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 750     750  
Debt instrument, interest rate, stated percentage 4.30%        
4.550% Senior Notes, due October 30, 2028 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 500     0  
Debt instrument, interest rate, stated percentage 4.55%        
4.375% Senior Notes, due May 1, 2029 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,250     1,250  
Debt instrument, interest rate, stated percentage 4.375%        
4.300% Senior Notes, due July 15, 2029 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 800     800  
Debt instrument, interest rate, stated percentage 4.30%        
4.600% Senior Notes, due October 15, 2030 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 500     500  
Debt instrument, interest rate, stated percentage 4.60%        
4.700% Senior Notes, due January 31, 2031 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,000     0  
Debt instrument, interest rate, stated percentage 4.70%   4.70%    
5.000% Senior Notes, due April 30, 2031 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,000     0  
Debt instrument, interest rate, stated percentage 5.00%        
7.750% Senior Notes, due October 15, 2031 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,450     1,450  
Debt instrument, interest rate, stated percentage 7.75%        
6.875% Senior Notes, due April 15, 2032 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,000     1,000  
Debt instrument, interest rate, stated percentage 6.875%        
5.250% Senior Notes, due April 30, 2033 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,000     0  
Debt instrument, interest rate, stated percentage 5.25%        
6.950% Senior Notes, due October 15, 2033 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,050     1,050  
Debt instrument, interest rate, stated percentage 6.95%        
6.000% Senior Notes, due April 15, 2034 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 500     500  
Debt instrument, interest rate, stated percentage 6.00%        
5.700% Senior Notes, due December 30, 2034 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 750     750  
Debt instrument, interest rate, stated percentage 5.70%        
5.250% Senior Notes, due October 15, 2035 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 750     750  
Debt instrument, interest rate, stated percentage 5.25%        
5.350% Senior Notes, due January 31, 2036 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,250     0  
Debt instrument, interest rate, stated percentage 5.35%   5.35%    
5.550% Senior Notes, due April 30, 2036 | Vistra Operations Senior Notes          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 1,500     0  
Debt instrument, interest rate, stated percentage 5.55%        
3.375% Revenue Bond, due August 1, 2029 | Energy Harbor Revenue Bonds          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 100     100  
Debt instrument, interest rate, stated percentage 3.375%        
4.750% Revenue Bonds, due June 1, 2033 and July 1, 2033 | Energy Harbor Revenue Bonds          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 285     285  
Debt instrument, interest rate, stated percentage 4.75%        
3.750% Revenue Bond, due October 1, 2047 | Energy Harbor Revenue Bonds          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 46     46  
Debt instrument, interest rate, stated percentage 3.75%        
Equipment Financing Agreements | Equipment Financing Agreements          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 46     46  
Equipment Financing Agreements | Equipment Financing Agreements          
Debt Instrument [Line Items]          
Total long-term debt, including amounts due currently $ 4     $ 0