Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

Commitments and Contingencies (Details) $ in Millions	1 Months Ended									12 Months Ended
Commitments and Contingencies (Details) $ in Millions	Jun. 30, 2026 USD ($) MW	Aug. 31, 2024 state	May 31, 2024 unit category petition	Aug. 31, 2023 application	Mar. 31, 2023 state	Oct. 31, 2022	Jul. 31, 2022 application	Jan. 31, 2022 application	Oct. 31, 2021 application	Dec. 31, 2025 application MW	Jul. 31, 2025 company MW	May 31, 2025 MW	Mar. 31, 2025 MW	Jan. 16, 2025 MW	Jul. 31, 2019 plant
Loss Contingencies [Line Items]
Committed capital	$ 1,000
Legal claim, duration						5 years
Number of nuclear power plants \| plant															2
Number of other companies \| company											25
Greenhouse gas emissions, final rule, number of states filing petitions challenging final rule \| petition			17
Environmental protection agency, number of categories of unit \| category			2
Environmental protection agency, number of potential unit \| unit			10
United States Environmental Protection Agency
Loss Contingencies [Line Items]
Cross-state air pollution rule, 2015 ozone national ambient air quality standards, federal implementation plan, beginning 2023 ozone season, number of states subject to rule \| state					22
Federal coal combustion residual rule, proposed groundwater monitoring and closure requirement, number of states challenging rule \| state		17
Illinois Environmental Protection Agency
Loss Contingencies [Line Items]
Coal combustion residuals, rules for closure of coal ash ponds in Illinois, number of operating permit applications filed \| application									18	11
Coal combustion residuals, rules for closure of coal ash ponds in Illinois, number of construction permit application filed \| application				1			5	3
Greenhouse Gas Emissions (GHG)
Loss Contingencies [Line Items]
Litigation, period			90 days
Moss Landing Power Plant (Battery Storage Project) \| Moss Landing Battery Energy Storage System Phase I
Loss Contingencies [Line Items]
Battery energy storage system capacity \| MW	300									100	300		300	300
Natural Gas-fueled Peaking Plant at Permian
Loss Contingencies [Line Items]
Battery energy storage system capacity \| MW												860
Letters of Credit \| Vistra Operations Company LLC
Loss Contingencies [Line Items]
Letters of credit outstanding	$ 3,587
Letters of Credit \| Vistra Operations Company LLC \| Support Risk Management and Trading Margin Requirements Including Over the Counter Hedging Transactions and Collateral Postings with Electric Reliability Council of Texas
Loss Contingencies [Line Items]
Letters of credit outstanding	3,006
Securities received as collateral	843
Letters of Credit \| Vistra Operations Company LLC \| Support Battery and Solar Development Projects
Loss Contingencies [Line Items]
Letters of credit outstanding	307
Letters of Credit \| Vistra Operations Company LLC \| Support Administrative Settlement Agreement and Order on Consent
Loss Contingencies [Line Items]
Letters of credit outstanding	110
Letters of Credit \| Vistra Operations Company LLC \| Support Retail Electric Provider's financial requirements with the Public Utility Commission of Texas
Loss Contingencies [Line Items]
Letters of credit outstanding	86
Letters of Credit \| Vistra Operations Company LLC \| Support Executory Contracts and Insurance Agreements
Loss Contingencies [Line Items]
Letters of credit outstanding	18
Letters of Credit \| Vistra Operations Company LLC \| Miscellaneous Credit Support Requirements
Loss Contingencies [Line Items]
Letters of credit outstanding	60
Surety Bonds \| Vistra Operations Company LLC
Loss Contingencies [Line Items]
Surety bonds outstanding	979
Amount of potential direct obligation under guarantee	81
Collateralized Securities \| Vistra Operations Company LLC
Loss Contingencies [Line Items]
Guarantor obligations, maximum exposure, undiscounted	$ 975