Debt, Credit Facilities, and Financings - Schedule of Line of Credit Facilities (Details) - USD ($) $ in Millions		12 Months Ended
	Dec. 31, 2024	Dec. 16, 2024
Debt Instrument [Line Items]
Facility Limit	$ 8,729
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	3,539
Letters of Credit Outstanding	1,278
Available Capacity	2,933
Line of Credit
Debt Instrument [Line Items]
Facility Limit	5,915
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	2,475
Letters of Credit Outstanding	1,278
Available Capacity	2,162
Vistra Operations debt
Debt Instrument [Line Items]
Facility Limit	7,665
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	2,475
Letters of Credit Outstanding	1,278
Available Capacity	2,933
Project-level debt
Debt Instrument [Line Items]
Facility Limit	1,064
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	1,064
Letters of Credit Outstanding	0
Available Capacity	0
Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Facility Limit	3,440
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	0
Letters of Credit Outstanding	1,278
Available Capacity	2,162
Term Loan B-3 Facility | Line of Credit
Debt Instrument [Line Items]
Facility Limit	2,475
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	2,475
Letters of Credit Outstanding	0
Available Capacity	0
Vistra Operations Commodity-Linked Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit	1,750
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	0
Letters of Credit Outstanding	0
Available Capacity	771
BCOP Credit Facilities Tax Credit 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 Facilities Tax Credit Bridge Loan | Bridge Loan | Oak Hill
Debt Instrument [Line Items]
Facility Limit	106
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	106
Letters of Credit Outstanding	0
Available Capacity	0
BCOP Credit Facilities Tax Credit Bridge Loan | Bridge Loan | Pulaski
Debt Instrument [Line Items]
Facility Limit	261
Cash Borrowings (Long-Term Debt, Including Amounts Due Currently)	261
Letters of Credit Outstanding	0
Available Capacity	$ 0
Vistra Zero Term Loan B Facility | Line of Credit | Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%	2.75%
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