Derivatives - Schedules of Concentration of Risk (Details) - Credit Risk Contract $ in Millions	6 Months Ended
Jun. 30, 2025 USD ($)
Derivative [Line Items]
Total credit risk exposure to all counterparties related to derivative contracts	$ 3,944
Net exposure to those counterparties after taking into effect master netting arrangements, setoff provisions and collateral	709
Largest net exposure to single counterparty	$ 282
Credit risk exposure to banking and financial sector percentage	76.00%
Net exposure to banking and financial sector percentage	15.00%

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-21

+ Details

Name:	us-gaap_ConcentrationRiskCreditRiskFinancialInstrumentMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 20
-Name Accounting Standards Codification
-Section 25
-Paragraph 6A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480682/815-20-25-6A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-5

+ Details

Name:	us-gaap_DerivativeLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Credit Derivative, Largest Net Exposure To Single Counterparty

+ References

No definition available.

+ Details

Name:	vistra_CreditDerivativeLargestNetExposureToSingleCounterparty
Namespace Prefix:	vistra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Credit Risk Exposure To Banking and Financial Sector Percentage

+ References

No definition available.

+ Details

Name:	vistra_CreditRiskExposureToBankingAndFinancialSectorPercentage
Namespace Prefix:	vistra_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Derivative Contract Counterparties, Maximum Potential Future Exposure on Credit Risk Derivatives, Net Exposure, After Effect Master Netting Arrangements, Setoff Provisions and Collateral

+ References

No definition available.

+ Details

Name:	vistra_DerivativeContractCounterpartiesMaximumPotentialFutureExposureOnCreditRiskDerivativesNetExposureAfterEffectMasterNettingArrangementsSetoffProvisionsAndCollateral
Namespace Prefix:	vistra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Net Exposure To Banking and Financial Sector Percentage

+ References

No definition available.

+ Details

Name:	vistra_NetExposureToBankingAndFinancialSectorPercentage
Namespace Prefix:	vistra_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_CreditRiskContractMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: