Property, Plant and Equipment, Net - PAC (Details) - PAC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 34,300	$ 34,013
Accumulated depreciation and amortization	(11,924)	(11,725)
Utility plant in-service, net	22,376	22,288
Plant, net	22,395	22,306
Construction work-in-progress	5,076	4,745
Property, plant and equipment, net	$ 27,471	27,051
Minimum
Property, Plant and Equipment [Line Items]
Useful life, generation	15 years
Useful life, transmission	60 years
Useful life, distribution	20 years
Useful life, intangible asset	5 years
Maximum
Property, Plant and Equipment [Line Items]
Useful life, generation	59 years
Useful life, transmission	90 years
Useful life, distribution	75 years
Useful life, intangible asset	75 years
Generation
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 13,964	13,904
Transmission
Property, Plant and Equipment [Line Items]
Utility plant in-service	8,278	8,216
Distribution
Property, Plant and Equipment [Line Items]
Utility plant in-service	9,204	9,060
Intangible plant and other
Property, Plant and Equipment [Line Items]
Utility plant in-service	2,854	2,833
Nonregulated
Property, Plant and Equipment [Line Items]
Plant, net	$ 19	$ 18
Nonregulated | Minimum
Property, Plant and Equipment [Line Items]
Useful life, other	14 years
Nonregulated | Maximum
Property, Plant and Equipment [Line Items]
Useful life, other	95 years