Property, Plant, and Equipment - Amortization of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	$ 548	$ 544	$ 1,765	$ 1,448
Depreciation and amortization | Power generation and structures and office and other equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	417	419	1,393	1,173
Depreciation and amortization | Finance lease right-of-use assets
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	2	2	6	6
Fuel, purchased power costs, and delivery fees/Depreciation and amortization | Nuclear fuel
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment expense	$ 129	$ 123	$ 366	$ 269