Property, Plant and Equipment, Net - EGTS (Details) - EGTS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 6,922	$ 6,803
Accumulated depreciation and amortization	(2,465)	(2,440)
Plant, net	4,457	4,363
Construction work-in-progress	147	141
Property, plant and equipment, net	4,604	4,504
Interstate natural gas transmission and storage assets
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 6,842	6,724
Interstate natural gas transmission and storage assets | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	28 years
Interstate natural gas transmission and storage assets | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	50 years
Intangible plant
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 80	$ 79
Intangible plant | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	12 years
Intangible plant | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	20 years