Debt, Credit Facilities and Financings - Schedule of Line of Credit Facilities (Details) $ in Millions	Jun. 30, 2025 USD ($)
Debt Instrument [Line Items]
Facility Limit	$ 8,925
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	4,596
Letters of Credit Outstanding	1,280
Available Capacity	2,160
Line of Credit
Debt Instrument [Line Items]
Facility Limit	5,902
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	2,462
Letters of Credit Outstanding	1,280
Available Capacity	2,160
Vistra Operations debt
Debt Instrument [Line Items]
Facility Limit	7,652
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	3,323
Letters of Credit Outstanding	1,280
Available Capacity	2,160
Project-level debt
Debt Instrument [Line Items]
Facility Limit	1,273
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	1,273
Letters of Credit Outstanding	0
Available Capacity	0
Revolving Credit Facility \| Line of Credit
Debt Instrument [Line Items]
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	0
Letters of Credit Outstanding	1,280
Available Capacity	2,160
Term Loan B-3 Facility \| Line of Credit
Debt Instrument [Line Items]
Letters of Credit Outstanding	0
Available Capacity	0
Vistra Operations Commodity-Linked Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	861
Letters of Credit Outstanding	0
Available Capacity	0
BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Facility Limit	576
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	576
Letters of Credit Outstanding	0
Available Capacity	0
BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026 \| Bridge Loan
Debt Instrument [Line Items]
Facility Limit	367
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	367
Letters of Credit Outstanding	0
Available Capacity	0
BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026 \| Construction Loans
Debt Instrument [Line Items]
Facility Limit	88
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	88
Letters of Credit Outstanding	0
Available Capacity	0
BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026 \| Term Loan
Debt Instrument [Line Items]
Facility Limit	121
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	121
Letters of Credit Outstanding	0
Available Capacity	0
BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026 \| Debt Service Reserve Commitment
Debt Instrument [Line Items]
Facility Limit	29
Letters of Credit Outstanding	7
Vistra Zero Term Loan B Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit	697
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	697
Letters of Credit Outstanding	0
Available Capacity	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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