Property, Plant and Equipment, Net - PAC (Details) - PAC - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 33,120	$ 33,009
Accumulated depreciation and amortization	(11,256)	(11,093)
Utility plant in-service, net	21,864	21,916
Plant, net	21,882	21,934
Construction work-in-progress	2,813	2,496
Property, plant and equipment, net	$ 24,695	24,430
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	$ 13,721	13,726
Transmission
Property, Plant and Equipment [Line Items]
Utility plant in-service	8,063	8,051
Distribution
Property, Plant and Equipment [Line Items]
Utility plant in-service	8,578	8,477
Intangible plant and other
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 2,758	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
Property, Plant and Equipment [Line Items]
Plant, net	$ 18	$ 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