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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis
Assets and liabilities measured at fair value on a recurring basis consisted of the following at the respective balance sheet dates shown below:
September 30, 2025December 31, 2024
Level
1		Level
2		Level
3		Reclass
(a)		TotalLevel
1		Level
2		Level
3		Reclass
(a)		Total
(in millions)
Assets:
Commodity contracts (b)$2,047 $416 $727 $28 $3,218 $1,923 $462 $841 $5 $3,231 
Interest rate swaps (b)— 20 — — 20 — 96 — — 96 
NDTs – equity securities (c)(d)1,769 — — 1,769 1,560 — — 1,560 
NDTs – debt securities (c)(e)110 1,877 — 1,987 83 1,976 — 2,059 
Sub-total$3,926 $2,313 $727 $28 6,994 $3,566 $2,534 $841 $5 6,946 
Assets measured at net asset value (f):
NDTs – equity securities (c)(d)(f)850 821 
NDTs - debt securities (c)(e)(f)323 — 
Total assets$8,167 $7,767 
Liabilities:
Commodity contracts (b)$2,574 $686 $1,674 $28 $4,962 $2,118 $975 $1,593 $5 $4,691 
Interest rate swaps (b)— 36 — — 36 — 27 — — 27 
Total liabilities$2,574 $722 $1,674 $28 $4,998 $2,118 $1,002 $1,593 $5 $4,718 
___________
(a)Fair values for each level are determined on a contract basis, but certain contracts are in both an asset and a liability position. This reclassification represents the adjustment needed to reconcile to the gross amounts presented in the condensed consolidated balance sheets.
(b)See Note 10 for additional information.
(c)NDT assets represent securities held for the purpose of funding the future retirement and decommissioning of our nuclear generation facilities. These investments include equity, debt and other fixed-income securities consistent with investment rules established by the NRC and the PUCT. The NDT investments are included in Investments in the condensed consolidated balance sheets. There were no significant concentrations of credit risk from an individual counterparty or groups of counterparties in our NDT portfolio as of September 30, 2025.
(d)The investment objective for NDT equity securities is to invest tax efficiently and to match the performance of the S&P 500 and Russell 3000 Indices for U.S. equity investments and the MSCI EAFE and MSCI All Country World ex-US Indices for non-U.S. equity investments.
(e)The investment objective for NDT debt securities is to invest in a diversified, high quality, tax efficient portfolio. The debt securities are weighted with government and investment grade corporate bonds. Other investable debt securities include, but are not limited to, municipal bonds, high yield bonds, securitized bonds, non-U.S. developed bonds, emerging market bonds, loans and treasury inflation-protected securities. The debt securities had an average coupon rate of 4.14% and 3.99% as of September 30, 2025 and December 31, 2024, respectively, and an average maturity of eight years and seven years as of September 30, 2025 and December 31, 2024, respectively. NDT debt securities held as of September 30, 2025 mature as follows: $783 million in one to five years, $1.074 billion in five to 10 years and $453 million after 10 years.
(f)Net asset value is a practical expedient used for the classification of assets that do not have readily determinable fair values and therefore are not classified in the fair value hierarchy. This amount is presented to permit reconciliation of this table to the amounts presented in the condensed consolidated balance sheets.
Schedule of Fair Value of the Level 3 Assets and Liabilities by Major Contract Type and the Significant Unobservable Inputs Used in the Valuations
The following tables present the fair value of Level 3 assets and liabilities by major contract type and the significant unobservable inputs used in the valuations as of September 30, 2025 and December 31, 2024:
September 30, 2025
Fair Value
Contract Type (a)AssetsLiabilitiesTotal, NetValuation TechniqueSignificant Unobservable InputRange (b)Average (b)
(in millions)
Electricity purchases and sales$467 $(1,457)$(990)Income ApproachHourly price curve shape (c)$—to$95$48
MWh
Illiquid delivery periods for hub power prices (d)$25to$135$80
MWh
Market Heat Rates (d)$25to$135$80
MWh
Options3 (173)(170)Option Pricing ModelNatural gas to power correlation (e)15%to100%58%
Power and natural gas volatility (e)5%to970%488%
Financial transmission rights/Congestion revenue rights231 (33)198 Market Approach (f)Illiquid price differences between settlement points (g)$(12)to$25$6.5
MWh
Natural gas16 (11)5 Income ApproachNatural gas basis (h)$(1)to$14$6
MMBtu
Illiquid delivery periods (i)$3to$5$4
MMBtu
Other (j)10 — 10 
Total$727 $(1,674)$(947)
December 31, 2024
Fair Value
Contract Type (a)AssetsLiabilitiesTotal,
Net		Valuation TechniqueSignificant Unobservable InputRange (b)Average (b)
(in millions)
Electricity purchases and sales$606 $(1,399)$(793)Income ApproachHourly price curve shape (c)$—to$95$48
MWh
Illiquid delivery periods for hub power prices (d)$25to$140$83
MWh
Market Heat Rates (d)$30to$150$90
MWh
Options6 (139)(133)Option Pricing ModelNatural gas to power correlation (e)10%to100%55%
Power and natural gas volatility (e)5%to710%358%
Financial transmission rights/Congestion revenue rights190 (25)165 Market Approach (f)Illiquid price differences between settlement points (g)$(35)to$20$(8)
MWh
Natural gas29 (30)(1)Income ApproachNatural gas basis (h)$—to$10$5
MMBtu
Illiquid delivery periods (i)$—to$5$2
MMBtu
Other (j)10 — 10 
Total$841 $(1,593)$(752)
____________
(a)(i) Electricity purchase and sales contracts include power and Heat Rate positions in ERCOT, PJM, ISO-NE, NYISO, MISO, and CAISO regions, (ii) Options consist of physical electricity options, spread options, and natural gas options, (iii) Forward purchase contracts (swaps and options) used to hedge electricity price differences between settlement points are referred to as congestion revenue rights (CRRs) in ERCOT and financial transmission rights (FTRs) in PJM, ISO-NE, NYISO, and MISO regions, and (iv) Natural gas contracts include swaps and forward contracts.
(b)The range of the inputs may be influenced by factors such as time of day, delivery period, season, and location. The average represents the arithmetic average of the underlying inputs and is not weighted by the related fair value or notional amount.
(c)Primarily based on the historical range of forward average hourly ERCOT North Hub and ERCOT South and West Zone prices.
(d)Primarily based on historical forward ERCOT and PJM power prices and ERCOT Heat Rate variability.
(e)Primarily based on the historical forward correlation and volatility within ERCOT and PJM.
(f)While we use the market approach, there is insufficient market data for the inputs to the valuation to consider the valuation liquid.
(g)Primarily based on the historical price differences between settlement points within ERCOT hubs and load zones.
(h)Primarily based on the historical forward PJM and Northeast natural gas basis prices and fixed prices.
(i)Primarily based on the historical forward natural gas fixed prices.
(j)Other includes contracts for coal and environmental allowances.
Schedule of Changes in Fair Value of the Level 3 Assets and Liabilities
The following table presents the changes in fair value of Level 3 assets and liabilities:
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
(in millions)
Net liability balance at beginning of period$(884)$(1,104)$(752)$(1,044)
Total unrealized valuation gains (losses)(299)482 (443)194 
Purchases, issuances and settlements (a):
Purchases94 62 226 193 
Issuances(4)(7)(10)(24)
Settlements(12)57 (103)196 
Transfers into Level 3 (b)1 5 (4)(15)
Transfers out of Level 3 (b)157 (12)139 (4)
Net liabilities assumed in connection with the Energy Harbor Merger— — — (13)
Net change(63)587 (195)527 
Net liability balance at end of period$(947)$(517)$(947)$(517)
Unrealized valuation losses relating to instruments held at end of period$(340)$361 $(519)$(114)
____________
(a)Settlements reflect reversals of unrealized mark-to-market valuations previously recognized in net income. Purchases and issuances reflect option premiums paid or received, including CRRs and FTRs.
(b)Includes transfers due to changes in the observability of significant inputs. All Level 3 transfers during the periods presented are in and out of Level 2. For the three months ended September 30, 2025, transfers into Level 3 primarily consist of power derivatives where forward pricing inputs have become unobservable and transfers out of Level 3 primarily consist of power and natural gas derivatives where forward pricing inputs have become observable. For the nine months ended September 30, 2025, transfers into Level 3 primarily consist of power derivatives where forward pricing inputs have become unobservable and transfers out of Level 3 primarily consist of power, natural gas and coal derivatives where forward pricing inputs have become observable. For the three months ended September 30, 2024, transfers into Level 3 primarily consist of natural gas derivatives where forward pricing inputs have become unobservable. For the nine months ended September 30, 2024, transfers into Level 3 primarily consist of power derivatives where forward pricing inputs have become unobservable and transfers out of Level 3 primarily consist of coal and natural gas derivatives where forward pricing inputs have become observable.
Schedule of Fair Value of Debt
September 30, 2025December 31, 2024
Instrument:Fair Value HierarchyCarrying
Amount		Fair
Value		Carrying
Amount		Fair
Value
(in millions)
Long-term debt under the Vistra Operations Credit FacilitiesLevel 2$2,421 $2,461 $2,435 $2,478 
BCOP Credit FacilityLevel 3774 790 344 367 
Vistra Zero Term Loan B FacilityLevel 2687 687 685 697 
Vistra Operations Senior NotesLevel 211,636 11,954 12,366 12,428 
Energy Harbor Revenue BondsLevel 2415 437 414 431 
Equipment Financing AgreementsLevel 355 55 54 53 
Forward Repurchase ObligationLevel 31,314 1,314 1,335 1,335