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Business and Significant Accounting Policies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
reportableSegment
Dec. 31, 2021
USD ($)
Feb. 29, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 31, 2021
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Number of reportable segments | reportableSegment 6          
Deferred tax assets, gross $ 2,532       $ 2,805  
Incremental Share Repurchase Program Approved by the Board Of Directors in March 2023            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Stock repurchase program, authorized amount       $ 1,000    
Incremental Share Repurchase Program Approved by the Board Of Directors in March 2023 | Subsequent Event            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Stock repurchase program, authorized amount     $ 1,500      
Vistra Corp. | Solar Generation and Battery Energy Storage Projects            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Deferred tax assets, gross $ 70       $ 70  
Public Utility Commission of Texas | Electric Reliability Council of Texas            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Securitization of costs allocated to load-serving entities during Winter storm Uri, total authorized           $ 2,100
Securitization of costs allocated to load-serving entities during Winter Storm Uri, amounts received by Vistra Corp.   $ 544