Property, Plant and Equipment, Net - EGTS (Details) - EGTS - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 7,142	$ 7,126
Accumulated depreciation and amortization	(2,598)	(2,563)
Plant, net	4,544	4,563
Construction work-in-progress	159	152
Property, plant and equipment, net	4,703	4,715
Interstate natural gas transmission and storage assets
Property, Plant and Equipment [Line Items]
Utility plant in-service	$ 7,060	7,046
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	$ 82	$ 80
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