Property, Plant and Equipment, Net - NPC (Details) - NPC - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2026	Dec. 31, 2025
Property, Plant, and Equipment [Line Items]
Plant, net	$ 9,142	$ 9,028
Construction work-in-progress	1,650	1,395
Property, plant and equipment, net	10,792	10,423
Regulated
Property, Plant, and Equipment [Line Items]
Generation	5,619	5,542
Distribution	1,879	1,886
Transmission	5,190	5,031
Intangible plant and other	1,000	951
Utility plant in-service	13,688	13,410
Accumulated depreciation and amortization	(4,547)	(4,383)
Plant, net	$ 9,141	9,027
Regulated \| Minimum
Property, Plant, and Equipment [Line Items]
Useful life, generation	30 years
Useful life, distribution	55 years
Useful life, transmission	24 years
Useful life, other	5 years
Regulated \| Maximum
Property, Plant, and Equipment [Line Items]
Useful life, generation	65 years
Useful life, distribution	75 years
Useful life, transmission	70 years
Useful life, other	65 years
Nonregulated
Property, Plant, and Equipment [Line Items]
Useful life, other	40 years
Plant, net	$ 1	$ 1

Public Utilities, Property, Plant And Equipment, Net, Excluding Construction Work In Progress

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