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Collateral Financing Agreement With Affiliate (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]    
Margin deposits posted under affiliate financing agreement $ 439 $ 0
7.233% Senior Secured Notes Due 2028 | Vistra Operations Senior Secured Notes:    
Debt Instrument [Line Items]    
Debt instrument, face amount $ 450  
Stated debt interest rate (percent) 7.233%  
Pre-Capitalized Trust Securities    
Debt Instrument [Line Items]    
Derivative, number of instruments held | security 450,000  
Notional Amount $ 450  
Facility Agreement    
Debt Instrument [Line Items]    
Debt fees and expenses, capitalized $ 7  
Facility fee, percentage 3.3608%