Property, Plant and Equipment, Net - EGTS (Details) - EGTS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 6,698	$ 6,591
Accumulated depreciation and amortization	(2,411)	(2,339)
Plant, net	4,287	4,252
Construction work-in-progress	188	188
Property, plant and equipment, net	4,475	4,440
Intangible plant
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 73	74
Intangible plant | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	11 years
Intangible plant | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	21 years
Interstate natural gas pipeline assets
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 6,625	$ 6,517
Interstate natural gas pipeline assets | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	18 years
Interstate natural gas pipeline assets | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	48 years