Property, Plant, and Equipment - Amortization of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	$ 621	$ 488	$ 1,217	$ 904
Depreciation and amortization | Power generation and structures and office and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	497	389	976	754
Depreciation and amortization | Finance lease right-of-use assets
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	2	2	4	4
Fuel, purchased power costs, and delivery fees | Nuclear fuel
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	$ 122	$ 97	$ 237	$ 146