Commitments and Contingencies - Narrative (Details) $ in Millions	1 Months Ended											12 Months Ended
	Aug. 31, 2024 state	May 31, 2024 petition	Aug. 31, 2023 application	May 31, 2023 facility unit category	Mar. 31, 2023 state	Oct. 31, 2022	Jul. 31, 2022 site	Jun. 30, 2022	Jan. 31, 2022 site insurance_company	Oct. 31, 2021 impoundment	Aug. 31, 2018	Dec. 31, 2024 USD ($) lawsuit	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Feb. 28, 2025	Jan. 31, 2025 MW	Jan. 16, 2025 lawsuit MW	Feb. 29, 2024 plant	Jun. 30, 2023 MW	Jul. 31, 2019 plant	Oct. 31, 2017 generation_unit	May 31, 2015 complaint
Long-term Purchase Commitment [Line Items]
Legal claim, duration						5 years
Number of nuclear power plants | plant																				2
Loss contingency, number of plaintiffs | insurance_company									100
Greenhouse gas emissions, final rule, number of states filing petitions challenging final rule | petition		17
Number of plants | plant																		4
Environmental protection agency, number of categories of unit | category				2
Environmental protection agency, number of potential unit | unit				10
Demand report submission period								90 days
Subsequent Event
Long-term Purchase Commitment [Line Items]
Loss contingency, pending claims, number | lawsuit																	2
Vermillion Facility Old East and North Sites
Long-term Purchase Commitment [Line Items]
Site contingency, number of sites with regulatory violations											2
Moss Landing Power Plant (Battery Storage Project) | Moss Landing Battery Energy Storage System Phase III
Long-term Purchase Commitment [Line Items]
Battery energy storage system capacity | MW																			350
Moss Landing Power Plant (Battery Storage Project) | Moss Landing Battery Energy Storage System Phase III | Subsequent Event
Long-term Purchase Commitment [Line Items]
Battery energy storage system capacity | MW																300	300
Maximum | Martin Lake Steam Electric Station
Long-term Purchase Commitment [Line Items]
Clean air act, regional haze program, best available retrofit technology alternative, sulfur dioxide emissions, number of years remaining before generation unit is subject to program				3 years
Maximum | Coleto Creek
Long-term Purchase Commitment [Line Items]
Clean air act, regional haze program, best available retrofit technology alternative, sulfur dioxide emissions, number of years remaining before generation unit is subject to program				5 years
United States Environmental Protection Agency
Long-term Purchase Commitment [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
Clean air act, regional haze program, best available retrofit technology alternative, sulfur dioxide emissions, sulfur dioxide emissions, number of units in texas subject to rule, total | generation_unit																					39
Clean air act, regional haze program, best available retrofit technology alternative, sulfur dioxide emissions, Number of electricity generation units in texas subject to program | facility				6
Federal coal combustion residual rule, proposed groundwater monitoring and closure requirement, number of states challenging rule | state	17
Illinois Environmental Protection Agency
Long-term Purchase Commitment [Line Items]
Coal combustion residuals, rules for closure of coal ash ponds in Illinois, number of operating permit applications filed | impoundment										18
Coal combustion residuals, rules for closure of coal ash ponds in Illinois, number of construction permit application filed			1				5		3
Greenhouse Gas Emissions (GHG) | Subsequent Event
Long-term Purchase Commitment [Line Items]
Litigation, period															60 days
Cross-State Air Pollution Rule (CSAPR) and Good Neighbor Plan | Subsequent Event
Long-term Purchase Commitment [Line Items]
Litigation, period															60 days
Legacy CCR Rulemaking | Subsequent Event
Long-term Purchase Commitment [Line Items]
Litigation, period															120 days
Gas Index Pricing Litigation | Wisconsin
Long-term Purchase Commitment [Line Items]
Loss contingency, pending claims, number | lawsuit												1
MISO 2015-2016 Planning Resource Auction
Long-term Purchase Commitment [Line Items]
Loss contingency, pending claims, number | complaint																						3
MISO 2015-2016 Planning Resource Auction | Pending Litigation
Long-term Purchase Commitment [Line Items]
Loss contingency, pending claims, number | complaint																						1
Letters of Credit | Vistra Operations Company LLC
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding, amount												$ 2,935
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
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding, amount												2,560
Letters of Credit | Vistra Operations Company LLC | Support Battery and Solar Development Projects
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding, amount												248
Letters of Credit | Vistra Operations Company LLC | Support Executory Contracts and Insurance Agreements
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding, amount												25
Letters of Credit | Vistra Operations Company LLC | Support Retail Electric Provider's financial requirements with the Public Utility Commission of Texas
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding, amount												86
Letters of Credit | Vistra Operations Company LLC | Miscellaneous Credit Support Requirements
Long-term Purchase Commitment [Line Items]
Letters of credit outstanding, amount												16
Surety Bonds | Vistra Operations Company LLC
Long-term Purchase Commitment [Line Items]
Surety bonds												1,087
Nuclear Fuel Contracts
Long-term Purchase Commitment [Line Items]
Contractual obligations expenditures												116
Coal transportation agreements
Long-term Purchase Commitment [Line Items]
Contractual obligations expenditures												$ 744	$ 936	$ 995