Property, Plant, and Equipment - Amortization of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	$ 592	$ 416
Depreciation and amortization | Power generation and structures and office and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	479	365
Depreciation and amortization | Finance lease right-of-use assets
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	2	2
Fuel, purchased power costs, and delivery fees | Nuclear fuel
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	$ 111	$ 49