Debt, Credit Facilities, and Financings - Narrative (Details) $ in Thousands		1 Months Ended						3 Months Ended	11 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 USD ($)	May 31, 2024 USD ($)	Apr. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jan. 31, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 09, 2024	Dec. 31, 2024 USD ($)	Dec. 16, 2024	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jul. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)
Debt Instrument [Line Items]
Facility Limit	$ 8,729,000	$ 8,729,000	$ 8,729,000							$ 8,729,000
Line of credit facility, borrowings outstanding	3,539,000	3,539,000	3,539,000							3,539,000
Maximum allowable distribution to parent company by consolidated subsidiary without consent	8,200,000	8,200,000	8,200,000							8,200,000
Total long-term debt including amounts due currently	16,298,000	16,298,000	16,298,000							16,298,000		$ 14,402,000
Proceeds from lines of credit										50,000		100,000	$ 1,750,000
Debt extinguishment gain										6,000		3,000	1,000
Accounts receivable financing	750,000	750,000	750,000							750,000		0
Accounts receivable repurchase facility, term														1 month
BCOP Credit Facility, Tax Credit Bridge Loan due November 1, 2025 / December 3, 2026
Debt Instrument [Line Items]
Facility Limit	367,000	367,000	367,000							367,000
Line of credit facility, borrowings outstanding	367,000	367,000	367,000							367,000
Alternate Letter Of Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Facility Limit	500,000	500,000	500,000							500,000
Letters of credit outstanding, amount	500,000	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	750,000	750,000	750,000							750,000		0
Accounts receivable securitization program, gross trade accounts receivable held by special purpose subsidiary	1,334,000	1,334,000	1,334,000							1,334,000
Accounts Receivable Securitization Program | Minimum
Debt Instrument [Line Items]
Account receivable securitization program, total borrowing capacity, july 2023 through july 2024															$ 750,000
Accounts Receivable Securitization Program | Maximum
Debt Instrument [Line Items]
Account receivable securitization program, total borrowing capacity, july 2024 through july 2025	1,000,000	1,000,000	1,000,000							1,000,000
Repurchase Facility
Debt Instrument [Line Items]
Accounts receivable repurchase facility, maximum borrowing capacity														$ 125,000
Accounts receivable repurchase facility, amounts borrowed	0	0	0							0		0
Vistra Operations Company LLC | Vistra Corp.
Debt Instrument [Line Items]
Maximum allowable distribution to parent company by consolidated subsidiary without consent	8,200,000	8,200,000	8,200,000							8,200,000
Cash dividends paid										1,705,000		$ 1,625,000	$ 1,775,000
Line of Credit
Debt Instrument [Line Items]
Facility Limit	5,915,000	5,915,000	5,915,000							5,915,000
Line of credit facility, borrowings outstanding	2,475,000	2,475,000	2,475,000							2,475,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit	3,440,000	3,440,000	3,440,000							3,440,000
Line of credit facility, borrowings outstanding	0	0	0							0
Line of Credit | Senior Secured Term Loan B-3 Facility
Debt Instrument [Line Items]
Facility Limit	2,475,000	2,475,000	2,475,000							2,475,000
Line of credit facility, borrowings outstanding	$ 2,475,000	$ 2,475,000	$ 2,475,000							$ 2,475,000
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%	5.984%	5.984%							5.984%
Line of Credit | Construction/Term Loan Commitments | Secured Debt
Debt Instrument [Line Items]
Facility Limit	$ 528,000	$ 528,000	$ 528,000							$ 528,000
Line of Credit | Vistra Zero Term Loan B Facility | Secured Debt
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	2.00%										2.75%
Debt instrument, face amount						$ 700,000		$ 700,000
Proceeds from lines of credit						$ 690,000
Debt, weighted average interest rate	6.36%	6.36%	6.36%							6.36%
Line of Credit | Vistra Operations Company LLC
Debt Instrument [Line Items]
Facility Limit	$ 5,915,000	$ 5,915,000	$ 5,915,000							$ 5,915,000
Collateral suspension provision effective date, grace period, number of days										60 days
Debt instrument, interest rate curing period										5.23%		5.69%	4.30%
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							$ 3,440,000		$ 3,175,000
Debt instrument, basis spread on variable rate										1.725%
Debt instrument, fee on undrawn amounts										0.270
Stated debt interest rate (percent)	1.725%	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 | Senior Secured Term Loan B-3 Facility
Debt Instrument [Line Items]
Line of credit facility, interest rate at period end	6.11%	6.11%	6.11%							6.11%
Debt instrument, periodic payment										$ 6,250
Line of Credit | Vistra Operations Company LLC | Senior Secured Term Loan B-3 Facility | Minimum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate			1.75%
Line of Credit | Vistra Operations Company LLC | Senior Secured Term Loan B-3 Facility | Maximum
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate									2.00%
Revolving Credit Facility | Senior Secured Commodity-Linked Revolving Credit Facility
Debt Instrument [Line Items]
Facility Limit	$ 1,750,000	$ 1,750,000	$ 1,750,000							1,750,000
Line of credit facility, borrowings outstanding	0	0	0							0
Revolving Credit Facility | Vistra Zero Term Loan B Facility
Debt Instrument [Line Items]
Facility Limit	697,000	697,000	697,000							697,000
Line of credit facility, borrowings outstanding	697,000	697,000	697,000							$ 697,000
Revolving Credit Facility | Vistra Operations Company LLC | Senior Secured Commodity-Linked Revolving Credit Facility
Debt Instrument [Line Items]
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	771,000	771,000	771,000							$ 771,000
Revolving Credit Facility | Vistra Operations Company LLC | Senior Secured Commodity-Linked 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
Revolving Credit Facility | Vistra Operations Company LLC | Senior Secured Commodity-Linked 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 facility, potential borrowing capacity, subject to ability to obtain additional commitments	$ 3,000,000	$ 3,000,000	$ 3,000,000							$ 3,000,000
Bridge Loan
Debt Instrument [Line Items]
Stated debt interest rate (percent)	1.625%	1.625%	1.625%							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	$ 367,000							$ 367,000		0
Letter of Credit
Debt Instrument [Line Items]
Stated debt interest rate (percent)	2.00%	2.00%	2.00%							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, amount	$ 29,000	$ 29,000	$ 29,000							$ 29,000
Letter of Credit | Vistra Operations Company LLC | Secured Letter of Credit Facilities
Debt Instrument [Line Items]
Letters of credit outstanding, amount	$ 1,157,000	$ 1,157,000	$ 1,157,000							$ 1,157,000
Building financing
Debt Instrument [Line Items]
Stated debt interest rate (percent)	1.875%	1.875%	1.875%							1.875%
Term Loan
Debt Instrument [Line Items]
Stated debt interest rate (percent)	2.00%	2.00%	2.00%							2.00%
Vistra Operations Senior Notes
Debt Instrument [Line Items]
Debt instrument, face amount	$ 1,250,000	$ 1,250,000	$ 1,250,000							$ 1,250,000
Proceeds from debt, net of issuance costs		1,240,000
Debt extinguishment gain								$ 6,000
Vistra Operations Senior Notes | 5.050% Senior Secured Notes, due December 30, 2026
Debt Instrument [Line Items]
Debt instrument, face amount	500,000	500,000	500,000							500,000
Vistra Operations Senior Notes | 5.700% Senior Secured Notes, due December 30, 2034
Debt Instrument [Line Items]
Debt instrument, face amount	750,000	750,000	750,000							750,000
Vistra Operations Senior Notes | 4.875% Senior Secured Notes, due May 13, 2024
Debt Instrument [Line Items]
Stated debt interest rate (percent)				4.875%
Vistra Operations Senior Notes | 3.550% Senior Secured Notes, due July 15, 2024
Debt Instrument [Line Items]
Stated debt interest rate (percent)														3.55%
Vistra Operations Senior Notes | 6.000% Senior Secured Notes, due April 15, 2034
Debt Instrument [Line Items]
Stated debt interest rate (percent)					6.00%
Debt instrument, face amount					$ 500,000
Proceeds from debt, net of issuance costs					$ 495,000
Vistra Operations Senior Notes | 6.875% Senior Unsecured Notes, due April 15, 2032
Debt Instrument [Line Items]
Stated debt interest rate (percent)					6.875%
Debt instrument, face amount					$ 1,000,000
Proceeds from debt, net of issuance costs					$ 990,000
Revenue Bonds
Debt Instrument [Line Items]
Debt instrument, face amount	431,000	431,000	431,000							431,000
Vistra Operations Senior Secured Notes:
Debt Instrument [Line Items]
Total long-term debt including amounts due currently	$ 5,144,000	$ 5,144,000	$ 5,144,000							$ 5,144,000		5,650,000
Debt instrument, repaid, principal							$ 759,000
Vistra Operations Senior Secured Notes: | 5.050% Senior Secured Notes, due December 30, 2026
Debt Instrument [Line Items]
Stated debt interest rate (percent)	5.05%	5.05%	5.05%							5.05%
Total long-term debt including amounts due currently	$ 500,000	$ 500,000	$ 500,000							$ 500,000		0
Vistra Operations Senior Secured Notes: | 5.700% Senior Secured Notes, due December 30, 2034
Debt Instrument [Line Items]
Stated debt interest rate (percent)	5.70%	5.70%	5.70%							5.70%
Total long-term debt including amounts due currently	$ 750,000	$ 750,000	$ 750,000							$ 750,000		0
Vistra Operations Senior Secured Notes: | 4.875% Senior Secured Notes, due May 13, 2024
Debt Instrument [Line Items]
Stated debt interest rate (percent)	4.875%	4.875%	4.875%							4.875%
Total long-term debt including amounts due currently	$ 0	$ 0	$ 0							$ 0		400,000
Debt instrument, repaid, principal							58,000
Vistra Operations Senior Secured Notes: | 3.550% Senior Secured Notes, due July 15, 2024
Debt Instrument [Line Items]
Stated debt interest rate (percent)	3.55%	3.55%	3.55%							3.55%
Total long-term debt including amounts due currently	$ 0	$ 0	$ 0							$ 0		1,500,000
Debt instrument, repaid, principal							345,000
Vistra Operations Senior Secured Notes: | 6.000% Senior Secured Notes, due April 15, 2034
Debt Instrument [Line Items]
Stated debt interest rate (percent)	6.00%	6.00%	6.00%							6.00%
Total long-term debt including amounts due currently	$ 500,000	$ 500,000	$ 500,000							$ 500,000		0
Vistra Operations Senior Secured Notes: | 6.950% Senior Secured Notes, due October 15, 2033
Debt Instrument [Line Items]
Stated debt interest rate (percent)	6.95%	6.95%	6.95%							6.95%
Total long-term debt including amounts due currently	$ 1,050,000	$ 1,050,000	$ 1,050,000							$ 1,050,000		1,050,000
Vistra Operations Senior Secured Notes: | 5.125% Senior Secured Notes, due May 13, 2025
Debt Instrument [Line Items]
Stated debt interest rate (percent)	5.125%	5.125%	5.125%							5.125%
Total long-term debt including amounts due currently	$ 744,000	$ 744,000	$ 744,000							$ 744,000		$ 1,100,000
Debt instrument, repaid, principal							$ 356,000