Property, Plant, and Equipment - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Depreciation			$ 1,670	$ 1,344	$ 1,388
Impairment of long-lived and other assets			$ 0	$ 49	$ 74
Kincaid | Kincaid
Impairment of long-lived and other assets	$ 49
Kincaid Generation, Property, Plant and Equipment | East
Impairment of long-lived and other assets	45
Kincaid Generation, Inventory | East
Impairment of long-lived and other assets	2
Kincaid Generation, Operating Lease Right-Of-Use Assets | East
Impairment of long-lived and other assets	$ 2
Miami Fort Power Station, Property, Plant and Equipment and Inventory | Miami Fort
Impairment of long-lived and other assets		$ 74
Miami Fort Power Station, Property, Plant And Equipment | East
Impairment of long-lived and other assets		71
Miami Fort Power Station, Inventory | East
Impairment of long-lived and other assets		$ 3
Minimum
Property, plant and equipment, useful life			1 year
Maximum
Property, plant and equipment, useful life			29 years