Property, Plant and Equipment, Net - SPPC (Details) - SPPC - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 3,534	$ 3,340
Common Facilities
Property, Plant and Equipment [Line Items]
Construction work-in-progress	228	219
Property, plant and equipment, net	3,534	3,340
Regulated | Generation
Property, Plant and Equipment [Line Items]
Generation	1,297	1,163
Transmission	982	940
Distribution	1,927	1,846
General and intangible	$ 215	204
Regulated | Generation | Minimum
Property, Plant and Equipment [Line Items]
Useful life, generation	25 years
Useful life, transmission	50 years
Useful life, distribution	20 years
Useful life, other	5 years
Regulated | Generation | Maximum
Property, Plant and Equipment [Line Items]
Useful life, generation	60 years
Useful life, transmission	100 years
Useful life, distribution	100 years
Useful life, other	70 years
Regulated | Natural Gas Processing Plant
Property, Plant and Equipment [Line Items]
Distribution	$ 453	438
General and intangible	$ 15	14
Regulated | Natural Gas Processing Plant | Minimum
Property, Plant and Equipment [Line Items]
Useful life, distribution	35 years
Useful life, other	5 years
Regulated | Natural Gas Processing Plant | Maximum
Property, Plant and Equipment [Line Items]
Useful life, distribution	70 years
Useful life, other	70 years
Regulated | Common Facilities
Property, Plant and Equipment [Line Items]
Common general	$ 382	370
Utility plant in-service	5,271	4,975
Accumulated depreciation and amortization	(1,965)	(1,854)
Plant, net	$ 3,306	$ 3,121
Regulated | Common Facilities | Minimum
Property, Plant and Equipment [Line Items]
Useful life, common general	5 years
Regulated | Common Facilities | Maximum
Property, Plant and Equipment [Line Items]
Useful life, common general	70 years