Property, Plant, and Equipment - Schedule 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	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Construction work in progress (a)	$ 1,557		$ 1,557		$ 1,060
Finance lease right-of-use assets	186		186		186
Property, plant and equipment — gross	26,834		26,834		26,635
Less accumulated depreciation and amortization	(8,541)		(8,541)		(8,020)
Less finance lease right-of-use assets accumulated amortization	(37)		(37)		(33)
Property, plant and equipment — net	17,736		17,736		18,173
Impairment of long-lived and other assets	68	$ 0	68	$ 0
Kincaid | Kincaid
Property, Plant and Equipment [Line Items]
Impairment of long-lived and other assets	68
Power generation and structures
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	22,298		22,298		22,783
Office and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	173		173		160
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	614		614		603
Nuclear fuel
Property, Plant and Equipment [Line Items]
Property, plant and equipment — gross	2,006		2,006		1,843
Less accumulated depreciation and amortization	$ (520)		$ (520)		$ (409)