Debt, Credit Facilities and Financings - Narrative (Details) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	May 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Apr. 01, 2025 USD ($)	Jul. 31, 2024 USD ($)	Apr. 30, 2024 USD ($)
Debt Instrument [Line Items]
Facility Limit			$ 8,723,000
Line of credit facility, borrowings outstanding			3,533,000
Total long-term debt, including amounts due currently			16,305,000		$ 16,298,000
Accounts receivable financing			1,082,000		750,000
Accounts receivable repurchase facility, term							1 month
Vistra Vision
Debt Instrument [Line Items]
Forward repurchase obligation to be paid			$ 1,355,000		$ 1,335,000
Vistra Vision | Measurement Input, Discount Rate
Debt Instrument [Line Items]
Noncontrolling interest, discount rate			0.06		0.06
BCOP Credit Facility, Tax Credit Bridge Loan due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Facility Limit			$ 367,000
Line of credit facility, borrowings outstanding			367,000
Alternate Letter Of Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Facility Limit			500,000
Letters of credit outstanding			500,000
Line of credit facility, increase (decrease), net	$ 500,000
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Accounts receivable financing			957,000		$ 750,000
Accounts receivable securitization program, gross trade accounts receivable held by special purpose subsidiary			1,346,000
Accounts Receivable Securitization Program | Maximum
Debt Instrument [Line Items]
Account receivable securitization program, total borrowing capacity, July 2024 through July 2025		$ 750,000		$ 750,000				$ 1,000,000
Repurchase Facility
Debt Instrument [Line Items]
Accounts receivable repurchase facility, maximum borrowing capacity							$ 125,000
Accounts receivable repurchase facility, amounts borrowed			125,000		0
Vistra Operations Company LLC | Vistra Corp.
Debt Instrument [Line Items]
Maximum allowable distribution to parent company by consolidated subsidiary without consent			10,200,000
Dividends paid			425,000	490,000
Line of Credit
Debt Instrument [Line Items]
Facility Limit			5,909,000
Line of credit facility, borrowings outstanding			2,469,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowings outstanding			$ 0
Line of Credit | BCOP Credit Facility, Tax Credit Bridge Loan due November 1, 2025 / December 3, 2026 | Secured Debt
Debt Instrument [Line Items]
Debt, weighted average interest rate			5.984%
Line of Credit | Construction/Term Loan Commitments | Secured Debt
Debt Instrument [Line Items]
Facility Limit					528,000
Line of Credit | Vistra Zero Project-Level Credit Agreement | Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.00%
Debt, weighted average interest rate			6.32%
Debt instrument, face amount		700,000		$ 700,000
Borrowings under Revolving Credit Facility		$ 690,000
Line of Credit | Vistra Operations Company LLC
Debt Instrument [Line Items]
Facility Limit			$ 5,909,000
Collateral suspension provision effective date, grace period, number of days			60 days
Debt instrument, interest rate during period			5.22%	5.56%
Line of Credit | Vistra Operations Company LLC | Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit			$ 3,440,000
Debt instrument, basis spread on variable rate			1.725%
Debt instrument, fee on undrawn amounts			0.270
Debt instrument, interest rate, stated percentage			1.725%
Line of Credit | Vistra Operations Company LLC | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.25%
Debt instrument, fee on undrawn amounts			0.175
Line of Credit | Vistra Operations Company LLC | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.00%
Debt instrument, fee on undrawn amounts			0.350
Line of Credit | Vistra Operations Company LLC | Term Loan B-3 Facility
Debt Instrument [Line Items]
Facility Limit			$ 2,469,000
Debt instrument, basis spread on variable rate			1.75%
Line of credit facility, borrowings outstanding			$ 2,469,000
Line of credit facility, interest rate at period end			6.07%
Debt instrument, periodic payment			$ 6,250
Revolving Credit Facility | Vistra Operations Commodity-Linked Facility
Debt Instrument [Line Items]
Line of credit facility, borrowings outstanding			0
Revolving Credit Facility | Vistra Zero Term Loan B Facility
Debt Instrument [Line Items]
Facility Limit			697,000
Line of credit facility, borrowings outstanding			697,000
Revolving Credit Facility | Vistra Operations Company LLC | Vistra Operations Commodity-Linked Facility
Debt Instrument [Line Items]
Facility Limit			$ 1,750,000
Debt instrument, basis spread on variable rate			1.725%
Debt instrument, fee on undrawn amounts			0.270
Line of credit facility, borrowing base capacity limit			$ 1,125,000
Revolving Credit Facility | Vistra Operations Company LLC | Vistra Operations Commodity-Linked Facility | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.25%
Debt instrument, fee on undrawn amounts			0.175
Revolving Credit Facility | Vistra Operations Company LLC | Vistra Operations Commodity-Linked Facility | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			2.00%
Debt instrument, fee on undrawn amounts			0.350
Line of credit facility, potential borrowing capacity, subject to ability to obtain additional commitments			$ 3,000,000
Bridge Loan
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			1.625%
Bridge Loan | BCOP Credit Facility, Tax Credit Bridge Loan due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Total long-term debt, including amounts due currently			$ 367,000		367,000
Bridge Loan | BCOP Credit Facility, Tax Credit Bridge Loan due November 1, 2025 / December 3, 2026 | Oak Hill
Debt Instrument [Line Items]
Facility Limit			106,000
Line of credit facility, borrowings outstanding			106,000
Bridge Loan | BCOP Credit Facility, Tax Credit Bridge Loan due November 1, 2025 / December 3, 2026 | Pulaski
Debt Instrument [Line Items]
Facility Limit			261,000
Line of credit facility, borrowings outstanding			$ 261,000
Letter of Credit
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.00%
Letter of Credit | BCOP Credit Facility, Tax Credit Bridge Loan due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Letters of credit outstanding					$ 29,000
Letter of Credit | Vistra Operations Company LLC | Secured Letter of Credit Facilities
Debt Instrument [Line Items]
Letters of credit outstanding			$ 1,091,000
Construction Loans
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			1.875%
Term Loan
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage			2.00%
Term loan period (in years)			20 years
Term Loan | Baldwin Term Loan | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, face amount						$ 75,000
Term Loan | Coffeen Term Loan | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, face amount						$ 46,000
Revenue Bonds
Debt Instrument [Line Items]
Debt instrument, face amount			$ 431,000