Property, Plant and Equipment, Net - PAC (Details) - PAC - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 32,631	$ 32,262
Accumulated depreciation and amortization	(10,874)	(10,507)
Utility plant in-service, net	21,757	21,755
Plant, net	21,775	21,773
Construction work-in-progress	1,639	1,141
Property, plant and equipment, net	$ 23,414	22,914
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
Useful life, other	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
Useful life, other	60 years
Generation
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 13,770	13,679
Transmission
Property, Plant and Equipment [Line Items]
Utility plant in-service	7,952	7,894
Distribution
Property, Plant and Equipment [Line Items]
Utility plant in-service	8,211	8,044
Intangible plant
Property, Plant and Equipment [Line Items]
Utility plant in-service	1,114	1,106
Other assets
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 1,584	1,539
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