Business And Significant Accounting Policies - Narrative (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($) segment	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Jan. 31, 2025 USD ($) facility MW	Jan. 16, 2025 MW	Jun. 30, 2023 MW
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of reportable segments | segment		5
Deferred tax assets, gross		$ 2,152	$ 2,532
Depreciation		1,670	1,344	$ 1,388
Property, plant, and equipment — net		18,173	12,432
Moss Landing Power Plant (Battery Storage Project) | Moss Landing Battery Energy Storage System Phase III
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Battery energy storage system capacity | MW							350
Moss Landing Power Plant (Battery Storage Project) | Moss Landing Battery Energy Storage System Phase III | Subsequent Event
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Battery energy storage system capacity | MW					300	300
Depreciation	$ 400
Number of battery facilities | facility					2
Property, plant, and equipment — net					$ 1,000
Number of offline battery facilities | facility					2
Vistra Corp. | Solar Generation and Battery Energy Storage Projects
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets, gross		$ 69	$ 69