Debt, Credit Facilities and Financings - Narrative (Details) $ in Thousands	1 Months Ended			3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	May 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Jul. 31, 2025 USD ($)	Jul. 02, 2025 USD ($)	May 31, 2025 USD ($)	May 20, 2025 USD ($)	Apr. 01, 2025 USD ($)	Jul. 31, 2024 USD ($)
Debt Instrument [Line Items]
Facility Limit	$ 8,925,000			$ 8,925,000		$ 8,925,000
Line of credit facility, borrowings outstanding	4,596,000			4,596,000		4,596,000
Total long-term debt, including amounts due currently	15,770,000			15,770,000		15,770,000		$ 16,298,000
Outstanding principal amount	15,770,000			15,770,000		15,770,000		16,298,000
Accounts receivable financing	1,125,000			$ 1,125,000		1,125,000		750,000
Accounts receivable repurchase facility, term														1 month
Redeemable noncontrolling interest, payments	80,000
Redeemable noncontrolling interest, principal payment	41,000					41,000	$ 0
Redeemable noncontrolling interest, interest payment	$ 39,000
Vistra Vision
Debt Instrument [Line Items]
Forward repurchase obligation to be paid						$ 1,295,000		$ 1,335,000
Vistra Vision | Measurement Input, Discount Rate
Debt Instrument [Line Items]
Noncontrolling interest, discount rate	0.06			0.06		0.06		0.06
BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Facility Limit	$ 576,000			$ 576,000		$ 576,000
Line of credit facility, borrowings outstanding	576,000			576,000		576,000
Alternate Letter Of Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Facility Limit	500,000			500,000		500,000
Letters of credit outstanding	500,000			500,000		500,000
Line of credit facility, increase (decrease), net		$ 500,000
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Accounts receivable financing	1,000,000			1,000,000		1,000,000		$ 750,000
Accounts receivable securitization program, gross trade accounts receivable held by special purpose subsidiary	1,624,000			1,624,000		1,624,000
Accounts Receivable Securitization Program | Maximum
Debt Instrument [Line Items]
Account receivable securitization program, total borrowing capacity	1,000,000			1,000,000		1,000,000
Accounts Receivable Securitization Program | Maximum | Subsequent Event
Debt Instrument [Line Items]
Account receivable securitization program, total borrowing capacity									$ 1,100,000
Repurchase Facility
Debt Instrument [Line Items]
Accounts receivable repurchase facility, maximum borrowing capacity														$ 125,000
Accounts receivable repurchase facility, amounts borrowed	125,000			125,000		125,000		0
Vistra Operations Company LLC | Vistra Corp.
Debt Instrument [Line Items]
Maximum allowable distribution to parent company by consolidated subsidiary without consent	10,300,000			10,300,000		10,300,000
Dividends paid				500,000	$ 500,000	925,000	$ 990,000
Line of Credit
Debt Instrument [Line Items]
Facility Limit	5,902,000			5,902,000		5,902,000
Line of credit facility, borrowings outstanding	2,462,000			2,462,000		2,462,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, borrowings outstanding	$ 0			$ 0		$ 0
Line of Credit | BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026 | Secured Debt
Debt Instrument [Line Items]
Debt, weighted average interest rate	5.935%			5.935%		5.935%
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	6.33%			6.33%		6.33%
Debt instrument, face amount			$ 700,000
Proceeds from lines of credit			$ 690,000
Line of Credit | Vistra Operations Company LLC
Debt Instrument [Line Items]
Facility Limit	$ 5,902,000			$ 5,902,000		$ 5,902,000
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			$ 3,440,000		$ 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%			1.725%		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	$ 2,462,000			$ 2,462,000		$ 2,462,000
Debt instrument, basis spread on variable rate						1.75%
Line of credit facility, borrowings outstanding	$ 2,462,000			$ 2,462,000		$ 2,462,000
Line of credit facility, interest rate at period end	6.08%			6.08%		6.08%
Debt instrument, periodic payment						$ 6,250
Revolving Credit Facility | Vistra Operations Commodity-Linked Facility
Debt Instrument [Line Items]
Line of credit facility, borrowings outstanding	$ 861,000			$ 861,000		861,000
Revolving Credit Facility | Vistra Zero Term Loan B Facility
Debt Instrument [Line Items]
Facility Limit	697,000			697,000		697,000
Line of credit facility, borrowings outstanding	697,000			697,000		697,000
Revolving Credit Facility | Vistra Operations Company LLC | Vistra Operations Commodity-Linked Facility
Debt Instrument [Line Items]
Facility Limit	1,750,000			1,750,000		$ 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	861,000			861,000		$ 861,000
Line of credit facility, borrowings outstanding, short-term	$ 861,000			$ 861,000		$ 861,000
Debt, weighted average interest rate	6.04%			6.04%		6.04%
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			$ 3,000,000		$ 3,000,000
Bridge Loan
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.625%			1.625%		1.625%
Bridge Loan | BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Facility Limit	$ 367,000			$ 367,000		$ 367,000
Line of credit facility, borrowings outstanding	367,000			367,000		367,000
Total long-term debt, including amounts due currently	367,000			367,000		367,000		367,000
Bridge Loan | BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026 | Oak Hill
Debt Instrument [Line Items]
Line of credit facility, borrowings outstanding	106,000			106,000		106,000
Bridge Loan | BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026 | Pulaski
Debt Instrument [Line Items]
Line of credit facility, borrowings outstanding	$ 261,000			$ 261,000		$ 261,000
Letter of Credit
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.00%			2.00%		2.00%
Letter of Credit | BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Letters of credit outstanding								29,000
Letter of Credit | Baldwin Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount													$ 7,000
Letter of Credit | Coffeen Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount													7,000
Letter of Credit | Vistra Operations Company LLC | Secured Letter of Credit Facilities
Debt Instrument [Line Items]
Letters of credit outstanding	$ 1,298,000			$ 1,298,000		$ 1,298,000
Term Loan
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	2.00%			2.00%		2.00%
Debt, weighted average interest rate	6.24%			6.24%		6.24%
Term loan period (in years)						20 years
Term Loan | BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Facility Limit	$ 121,000			$ 121,000		$ 121,000
Line of credit facility, borrowings outstanding	121,000			121,000		121,000
Total long-term debt, including amounts due currently	$ 121,000			$ 121,000		$ 121,000		0
Term Loan | Baldwin Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount													75,000
Term Loan | Coffeen Term Loan
Debt Instrument [Line Items]
Debt instrument, face amount													$ 46,000
Term Loan | Oak Hill
Debt Instrument [Line Items]
Debt instrument, face amount												$ 88,000
Term Loan | Pulaski | Subsequent Event
Debt Instrument [Line Items]
Debt instrument, face amount									$ 168,000	$ 168,000
Construction Loans
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	1.875%			1.875%		1.875%
Construction Loans | BCOP Credit Facility, Bridge Loans due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Facility Limit	$ 88,000			$ 88,000		$ 88,000
Line of credit facility, borrowings outstanding	88,000			88,000		88,000
Total long-term debt, including amounts due currently	88,000			88,000		88,000		0
Vistra Operations Senior Secured Notes
Debt Instrument [Line Items]
Total long-term debt, including amounts due currently	$ 4,400,000			$ 4,400,000		$ 4,400,000		5,144,000
Vistra Operations Senior Secured Notes | 5.125% Senior Secured Notes, due May 13, 2025
Debt Instrument [Line Items]
Debt instrument, interest rate, stated percentage	5.125%			5.125%		5.125%					5.125%
Total long-term debt, including amounts due currently	$ 0			$ 0		$ 0		$ 744,000
Outstanding principal amount											$ 744,000
Revenue Bonds
Debt Instrument [Line Items]
Debt instrument, face amount	$ 431,000			$ 431,000		$ 431,000