Debt, Credit Facilities, and Financings - Schedule of Debt (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt Instrument [Line Items]
Long-term debt before unamortized premiums, discounts and issuance costs	$ 19,764	$ 17,196
Unamortized premiums, discounts and issuance costs	(169)	(153)
Long-term debt including amounts due currently	19,595	17,043
Short-term borrowings	0	1,800
Accounts receivable financing	300	1,225
Forward repurchase obligation	613	632
Project-level debt
Debt Instrument [Line Items]
Long-term debt before unamortized premiums, discounts and issuance costs	1,633	1,569
Vistra Operations debt
Debt Instrument [Line Items]
Long-term debt before unamortized premiums, discounts and issuance costs	$ 18,131	$ 15,627

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of unamortized debt discount (premium) and debt issuance costs.

+ References + Details

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

+ Details

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References + Details