Property, Plant and Equipment, Net - NPC (Details) - NPC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Utility plant in-service, net, excluding construction work-in-process	$ 8,591	$ 7,568
Construction work- in-progress	810	1,090
Property, plant and equipment, net	$ 9,401	$ 8,658
Depreciation and amortization rate	2.80%	3.10%	3.10%
Regulated assets
Property, Plant and Equipment [Line Items]
Generation	$ 5,369	$ 4,476
Transmission	1,660	1,590
Distribution	4,754	4,451
Intangible plant and other	900	906
Utility plant in-service	12,683	11,423
Accumulated depreciation and amortization	(4,093)	(3,856)
Utility plant in-service, net, excluding construction work-in-process	8,590	7,567
Nonregulated assets
Property, Plant and Equipment [Line Items]
Utility plant in-service, net, excluding construction work-in-process	$ 1	$ 1
Useful life, other	40 years
Minimum | Regulated assets
Property, Plant and Equipment [Line Items]
Useful life, generation	30 years
Useful life, transmission	55 years
Useful life, distribution	24 years
Useful life, other	5 years
Maximum | Regulated assets
Property, Plant and Equipment [Line Items]
Useful life, generation	65 years
Useful life, transmission	75 years
Useful life, distribution	70 years
Useful life, other	65 years