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Acquisitions and Dispositions - Narrative (Details) $ / shares in Units, $ in Millions			1 Months Ended
	Dec. 31, 2025 USD ($) facility $ / shares MW shares	Oct. 22, 2025 USD ($) facility MW	Mar. 31, 2026 USD ($)	Jun. 30, 2026 megawatt
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Vistra Operations
Business Combination [Line Items]
Number of megawatts \| megawatt				754
Cogentrix Energy
Business Combination [Line Items]
Number of natural gas generation facilities acquired \| facility	10
Number of natural gas generation facilities capacity in megawatts \| MW	5,500
Number of combined cycle gas turbine facilities acquired \| facility	3
Total purchase price	$ 2,300
Principal outstanding	$ 1,500
Consideration transferred number of shares (in shares) \| shares	5,000,000
Business combination, price per share (in dollars per share) \| $ / shares	$ 0.01
Consideration transferred, equity interest (in dollars per share) \| $ / shares	$ 185
Cogentrix Energy \| PJM (Mid-Atlantic)
Business Combination [Line Items]
Number of combined cycle gas turbine facilities acquired \| facility	2
Cogentrix Energy \| ISO-New England
Business Combination [Line Items]
Number of combined cycle gas turbine facilities acquired \| facility	4
Cogentrix Energy \| ERCOT (Texas)
Business Combination [Line Items]
Number of combined cycle gas turbine facilities acquired \| facility	1
Lotus Infrastructure Partners
Business Combination [Line Items]
Number of natural gas generation facilities acquired \| facility		7
Number of natural gas generation facilities capacity in megawatts \| MW		2,600
Total purchase price		$ 1,900
Principal outstanding		800
Cash consideration		1,100	$ 1,231
Business combination, consideration transferred, including adjustments		$ 1,237
Business combination, additional consideration transferred, net			$ 6
Lotus Infrastructure Partners \| Vistra Operations
Business Combination [Line Items]
Acquiring of membership interest		100.00%