Property, Plant and Equipment, Net - NPC (Details) - NPC - USD ($) $ in Millions		3 Months Ended
	Jan. 01, 2024	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Plant, net		$ 7,641	$ 7,568
Construction work-in-progress		1,206	1,090
Property, plant and equipment, net		8,847	8,658
Depreciation and amortization expense, annual decrease	$ 31
Regulated
Property, Plant and Equipment [Line Items]
Generation		4,511	4,476
Distribution		1,630	1,590
Transmission		4,518	4,451
Intangible plant and other		907	906
Utility plant in-service		11,566	11,423
Accumulated depreciation and amortization		(3,926)	(3,856)
Plant, net		$ 7,640	7,567
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		76 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