Debt, Credit Facilities, and Financings - Schedule of Debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Long-term debt before unamortized premiums, discounts, and issuance costs	$ 16,469	$ 14,517
Unamortized premiums, discounts, and debt issuance costs	(171)	(115)
Long-term debt including debt due currently	16,298	14,402
Accounts receivable financing	750	0
Forward repurchase obligation	1,335	0
Project-level debt
Debt Instrument [Line Items]
Long-term debt before unamortized premiums, discounts, and issuance costs	1,064	0
Vistra Operations debt
Debt Instrument [Line Items]
Long-term debt before unamortized premiums, discounts, and issuance costs	$ 15,405	$ 14,517