Property, Plant and Equipment, Net - EGTS (Details) - EGTS $ in Millions	1 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) a	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Property, Plant and Equipment [Line Items]
Utility plant in-service		$ 7,126	$ 6,803
Accumulated depreciation and amortization		(2,563)	(2,440)
Utility plant in-service, net, excluding construction work-in-process		4,563	4,363
Construction work- in-progress		152	141
Property, plant and equipment, net		4,715	4,504
Oil and gas, developed acreage | a	6,500,000
Proceeds from assignment of shale development rights	$ 8	8	0	$ 0
Shale development rights gain	8
Shale development rights, gain after-tax	$ 6
Interstate natural gas transmission and storage assets
Property, Plant and Equipment [Line Items]
Utility plant in-service		$ 7,046	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