Property, Plant and Equipment, Net - EGTS (Details) - EGTS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 6,803	$ 6,591
Accumulated depreciation and amortization	(2,440)	(2,339)
Utility plant in-service, net, excluding construction work-in-process	4,363	4,252
Construction work- in-progress	141	188
Property, plant and equipment, net	4,504	4,440
Interstate natural gas pipeline assets
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 6,724	6,517
Interstate natural gas pipeline assets | Minimum
Property, Plant and Equipment [Line Items]
Depreciable life	28 years
Interstate natural gas pipeline assets | Maximum
Property, Plant and Equipment [Line Items]
Depreciable life	50 years
Intangible plant
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 79	$ 74
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