Debt, Credit Facilities and Financings - Schedule of Debt (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Long -term debt before unamortized premiums, discounts and issuance costs	$ 16,463	$ 16,469
Unamortized debt premiums, discounts and issuance costs	(158)	(171)
Long-term debt including amounts due currently	16,305	16,298
Accounts receivable financing	1,082	750
Forward repurchase obligation	1,355	1,335
Project-level debt
Debt Instrument [Line Items]
Long -term debt before unamortized premiums, discounts and issuance costs	1,064	1,064
Vistra Operations debt
Debt Instrument [Line Items]
Long -term debt before unamortized premiums, discounts and issuance costs	$ 15,399	$ 15,405