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Commitments and Contingencies - Narrative (Details)
$ in Millions
 1 Months Ended 12 Months Ended
Aug. 31, 2023
closureConstructionApplication
May 31, 2023
unit
facility
category
Mar. 31, 2023
State
Oct. 31, 2022
Jul. 31, 2022
site
Jun. 30, 2022
Jan. 31, 2022
insuranceCompany
MW
Oct. 31, 2021
impoundment
Aug. 31, 2018
Dec. 31, 2023
USD ($)
utilityOperatingCompany
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Feb. 29, 2024
plant
Oct. 31, 2017
May 31, 2015
complaint
Long-term Purchase Commitment [Line Items]                              
Legal claim, duration       5 years                      
Loss contingency, number of plaintiffs | insuranceCompany             100                
Environmental protection agency, number of categories of unit | category   2                          
Environmental protection agency, number of CCR management unit | unit   134                          
Environmental protection agency, number of different facility | facility   82                          
Environmental protection agency, number of potential unit | unit   6                          
Demand report submission period           90 days                  
Vermillion Facility Old East and North Sites                              
Long-term Purchase Commitment [Line Items]                              
Site contingency, number of sites with regulatory violations                 2            
Subsequent Event                              
Long-term Purchase Commitment [Line Items]                              
Number of plants | plant                         5    
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                          
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                          
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                           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                          
Utility solid waste activities group, member entities, number | utilityOperatingCompany                   130          
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                
Gas Index Pricing Litigation | Wisconsin                              
Long-term Purchase Commitment [Line Items]                              
Loss contingency, pending claims, number                   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                   $ 2,750          
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                   2,408          
Letters of Credit | Vistra Operations Company LLC | Support Battery and Solar Development Projects                              
Long-term Purchase Commitment [Line Items]                              
Letters of credit outstanding, amount                   186          
Letters of Credit | Vistra Operations Company LLC | Support Executory Contracts and Insurance Agreements                              
Long-term Purchase Commitment [Line Items]                              
Letters of credit outstanding, amount                   27          
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                   91          
Letters of Credit | Vistra Operations Company LLC | Miscellaneous Credit Support Requirements                              
Long-term Purchase Commitment [Line Items]                              
Letters of credit outstanding, amount                   38          
Surety Bonds | Vistra Operations Company LLC                              
Long-term Purchase Commitment [Line Items]                              
Surety bonds                   935          
Nuclear Fuel Contracts                              
Long-term Purchase Commitment [Line Items]                              
Contractual obligations expenditures                   61          
Coal transportation agreements                              
Long-term Purchase Commitment [Line Items]                              
Contractual obligations expenditures                   $ 936 $ 995 $ 850