Acquisitions - Narrative (Details) $ in Millions				3 Months Ended	6 Months Ended
	May 15, 2025 USD ($) facility MW	Sep. 18, 2024 USD ($)	Mar. 01, 2024 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)
Energy Harbor
Business Combination [Line Items]
Total purchase price			$ 4,596
Fair value of noncontrolling interest in Energy Harbor			811
Business combination, acquisition related costs				$ 0	$ 24
Vistra Operations | Lotus Infrastructure Partners
Business Combination [Line Items]
Acquiring of membership interests	100.00%
Number of natural gas generation facilities acquired | facility	7
Number of natural gas generation facilities capacity in megawatt | MW	2,600
Total purchase price	$ 1,900
Business combination, consideration transferred, expected to be assumed. percentage	50.00%
Vistra Vision
Business Combination [Line Items]
Subsidiary, ownership percentage, noncontrolling owner		15.00%
Fair value of noncontrolling interest in Energy Harbor			$ 749
Payments to acquire interest in subsidiaries and affiliates		$ 3,200
Vistra Vision | Energy Harbor
Business Combination [Line Items]
Subsidiary, ownership percentage, noncontrolling owner			15.00%
Subsidiary, ownership percentage, parent			85.00%