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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%

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