Property, Plant, and Equipment - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Construction work in progress	$ 1,394	$ 1,060
Finance lease right-of-use assets	186	186
Property, plant and equipment — gross	26,690	26,635
Less accumulated depreciation and amortization	(8,415)	(8,020)
Less finance lease right-of-use assets accumulated amortization	(35)	(33)
Property, plant and equipment — net	17,716	18,173
Power generation and structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	22,303	22,783
Office and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	172	160
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	603	603
Nuclear fuel
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	2,032	1,843
Less accumulated depreciation and amortization	$ (524)	$ (409)