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Debt - Schedule of Long-Term Debt Instruments (Details) - USD ($)
$ in Millions
Jan. 31, 2024
Dec. 31, 2023
Dec. 20, 2023
Dec. 31, 2022
May 31, 2021
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 14,402   $ 11,971  
Total other long-term debt   67   79  
Unamortized debt premiums, discounts and issuance costs   (115) $ 25 (72)  
Less amounts due currently   (2,286)   (38)  
Total long-term debt less amounts due currently   12,116   11,933  
Vistra Operations Senior Secured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   5,650   4,600  
Vistra Operations Senior Unsecured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   6,300   4,850  
Vistra Operations Credit Facilities, Term Loan B-3 Facility due December 20, 2030 | Line of Credit          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   2,500   2,514  
4.875% Senior Secured Notes, due May 13, 2024 | Vistra Operations Senior Secured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 400   400  
Stated debt interest rate (percent)   4.875%      
4.875% Senior Secured Notes, due May 13, 2024 | Vistra Operations Senior Secured Notes: | Subsequent Event          
Debt Instrument [Line Items]          
Stated debt interest rate (percent) 4.875%        
3.550% Senior Secured Notes, due July 15, 2024 | Vistra Operations Senior Secured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,500   1,500  
Stated debt interest rate (percent)   3.55%      
3.550% Senior Secured Notes, due July 15, 2024 | Vistra Operations Senior Secured Notes: | Subsequent Event          
Debt Instrument [Line Items]          
Stated debt interest rate (percent) 3.55%        
5.125% Senior Secured Notes, due May 13, 2025 | Vistra Operations Senior Secured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,100   1,100  
Stated debt interest rate (percent)   5.125%      
5.125% Senior Secured Notes, due May 13, 2025 | Vistra Operations Senior Secured Notes: | Subsequent Event          
Debt Instrument [Line Items]          
Stated debt interest rate (percent) 5.125%        
3.700% Senior Secured Notes, due January 30, 2027 | Vistra Operations Senior Secured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 800   800  
Stated debt interest rate (percent)   3.70%      
4.300% Senior Secured Notes, due July 15, 2029 | Vistra Operations Senior Secured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 800   800  
Stated debt interest rate (percent)   4.30%      
6.950% Senior Secured Notes, due October 15, 2033 | Vistra Operations Senior Secured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,050   0  
Unamortized debt premiums, discounts and issuance costs   $ (9)      
Stated debt interest rate (percent)   6.95%      
6.950% Senior Secured Notes, due October 15, 2033 | Vistra Operations Senior Secured Notes: | Subsequent Event          
Debt Instrument [Line Items]          
Stated debt interest rate (percent) 6.95%        
6.950% Senior Secured Notes, due October 15, 2033 | Vistra Operations Senior Unsecured Notes          
Debt Instrument [Line Items]          
Unamortized debt premiums, discounts and issuance costs   $ (7)      
5.500% Senior Unsecured Notes, due September 1, 2026 | Vistra Operations Senior Unsecured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,000   1,000  
Stated debt interest rate (percent)   5.50%      
5.625% Senior Unsecured Notes, due February 15, 2027 | Vistra Operations Senior Unsecured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,300   1,300  
Stated debt interest rate (percent)   5.625%      
5.000% Senior Unsecured Notes, due July 31, 2027 | Vistra Operations Senior Unsecured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,300   1,300  
Stated debt interest rate (percent)   5.00%      
4.375% Senior Unsecured Notes, due May 15, 2029 | Vistra Operations Senior Unsecured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,250   1,250  
Stated debt interest rate (percent)   4.375%     4.375%
7.750% Senior Unsecured Notes, due October 15, 2031 | Vistra Operations Senior Unsecured Notes:          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 1,450   0  
Stated debt interest rate (percent)   7.75%      
7.750% Senior Unsecured Notes, due October 15, 2031 | Vistra Operations Senior Unsecured Notes: | Subsequent Event          
Debt Instrument [Line Items]          
Stated debt interest rate (percent) 7.75%        
Equipment Financing Agreements | Unsecured Debt          
Debt Instrument [Line Items]          
Total long-term debt including amounts due currently   $ 67   $ 79