Property, Plant and Equipment, Net - PAC (Details) - PAC - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 33,009	$ 32,262
Accumulated depreciation and amortization	(11,093)	(10,507)
Utility plant in-service, net	21,916	21,755
Utility plant in-service, net, excluding construction work-in-process	21,934	21,773
Construction work- in-progress	2,496	1,141
Property, plant and equipment, net	$ 24,430	$ 22,914
Depreciation and amortization rate	3.50%	3.50%	4.10%
Amount of acquisition adjustments	$ 156	$ 156
Acquisition adjustments, accumulated depreciation	$ 144	143
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	$ 13,726	13,679
Transmission
Property, Plant and Equipment [Line Items]
Utility plant in-service	8,051	7,894
Distribution
Property, Plant and Equipment [Line Items]
Utility plant in-service	8,477	8,044
Intangible plant
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 2,755	2,645
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