Property, Plant and Equipment, Net - PAC (Details) - PAC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 34,013	$ 33,009
Accumulated depreciation and amortization	(11,725)	(11,093)
Utility plant in-service, net	22,288	21,916
Utility plant in-service, net, excluding construction work-in-process	22,306	21,934
Construction work- in-progress	4,745	2,496
Property, plant and equipment, net	$ 27,051	$ 24,430
Depreciation and amortization rate	3.40%	3.50%	3.50%
Amount of acquisition adjustments	$ 156	$ 156
Acquisition adjustments, accumulated depreciation	$ 145	144
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	$ 13,904	13,726
Transmission
Property, Plant and Equipment [Line Items]
Utility plant in-service	8,216	8,051
Distribution
Property, Plant and Equipment [Line Items]
Utility plant in-service	9,060	8,477
Intangible plant
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 2,833	2,755
Computer software | Minimum
Property, Plant and Equipment [Line Items]
Useful life, intangible asset	5 years
Computer software | Maximum
Property, Plant and Equipment [Line Items]
Useful life, intangible asset	10 years
Nonregulated assets
Property, Plant and Equipment [Line Items]
Utility plant in-service, net, excluding construction work-in-process	$ 18	$ 18
Nonregulated assets | Minimum
Property, Plant and Equipment [Line Items]
Useful life, other	14 years
Nonregulated assets | Maximum
Property, Plant and Equipment [Line Items]
Useful life, other	95 years