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Collateral Financing Agreement With Affiliate (Details) $ in Millions	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Jun. 15, 2023 USD ($) security
Debt Instrument [Line Items]
Margin deposits posted under affiliate financing agreement	$ 435	$ 439
Margin deposits financing with affiliate	435	$ 439
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
Derivative, notional amount			$ 450
Facility Agreement
Debt Instrument [Line Items]
Facility fee, percentage	3.3608%