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Debt, Credit Facilities, and Financings - Schedule of Debt Instrument Redemption (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2024
Redeemable Noncontrolling Interest [Line Items]
Dividends to noncontrolling interest		$ (15)
Principal payment on Closing Date		$ (1,748)	$ 0	$ 0
Discount rate	6.00%	6.00%
Vistra Vision
Redeemable Noncontrolling Interest [Line Items]
Redeemable NCI at September 30, 2024					$ 3,198
Income attributable to redeemable noncontrolling interest	$ 51
Dividends to noncontrolling interest	(165)
Principal payment on Closing Date	(1,749)
Forward repurchase obligation		$ 1,335
Noncontrolling Interest in Subsidiary
Redeemable Noncontrolling Interest [Line Items]
Dividends to noncontrolling interest		(15)
Noncontrolling Interest in Subsidiary \| Vistra Vision
Redeemable Noncontrolling Interest [Line Items]
Redeemable noncontrolling interest balance at Closing Date	$ 3,084	$ 3,084