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Supplementary Financial Information - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2021
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets       $ 49 $ 74 $ 71  
Unbilled receivables, current   $ 607   614 607    
Depreciation       1,344 1,388 1,478  
Asset retirement obligation   2,437   2,538 2,437 2,450 $ 2,436
Regulatory liabilities   0   209 0    
Domestic Tax Authority              
Impaired Long-Lived Assets Held and Used [Line Items]              
Taxes paid       0 1 0  
State and Local Jurisdiction              
Impaired Long-Lived Assets Held and Used [Line Items]              
Taxes paid       44 33 52  
Proceeds from income tax refunds       13 8 2  
Nuclear Plant Decommissioning              
Impaired Long-Lived Assets Held and Used [Line Items]              
Asset retirement obligation   1,688   1,742 $ 1,688 $ 1,635 $ 1,585
Regulatory liabilities       $ 209      
Minimum              
Impaired Long-Lived Assets Held and Used [Line Items]              
Property, plant and equipment, useful life       1 year      
Maximum              
Impaired Long-Lived Assets Held and Used [Line Items]              
Property, plant and equipment, useful life       30 years      
Debt Securities              
Impaired Long-Lived Assets Held and Used [Line Items]              
Decommissioning fund investments, debt maturities, one through five years, fair value       $ 296      
Decommissioning fund investments, debt maturities, five through ten years, fair value       142      
Decommissioning fund investments, debt maturities, after ten years, fair value       $ 296      
Line of Credit | Vistra Operations Company LLC              
Impaired Long-Lived Assets Held and Used [Line Items]              
Debt instrument, interest rate curing period       5.69% 4.30% 3.90%  
Kincaid | Sunset              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets $ 49            
Kincaid Generation, Property, Plant and Equipment | Sunset              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets 45            
Kincaid Generation, Inventory | Sunset              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets 2            
Kincaid Generation, Operating Lease Right-Of-Use Assets | Sunset              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets $ 2            
Miami Fort Power Station, Property, Plant and Equipment and Inventory | Sunset              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets   74          
Miami Fort Power Station, Property, Plant And Equipment | Sunset              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets   71          
Miami Fort Power Station, Inventory | Sunset              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets   $ 3          
William H. Zimmer Power Station, Property, Plant and Equipment and Inventory | Asset Closure              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets     $ 38        
William H. Zimmer Power Station, Property, Plant and Equipment | Asset Closure              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets     33        
William H. Zimmer Power Station, Inventory | Asset Closure              
Impaired Long-Lived Assets Held and Used [Line Items]              
Impairment of long-lived and other assets     $ 5