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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 |

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