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Property, Plant and Equipment, Net - EGTS (Details) - EGTS
$ in Millions
1 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
a
Jun. 30, 2023
USD ($)
a
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Property, Plant and Equipment [Line Items]        
Utility plant in-service $ 6,970 $ 6,970   $ 6,803
Accumulated depreciation and amortization (2,498) (2,498)   (2,440)
Plant, net 4,472 4,472   4,363
Construction work-in-progress 183 183   141
Property, plant and equipment, net $ 4,655 $ 4,655   4,504
Oil and gas, developed acreage | a 6,500 6,500    
Proceeds from assignment of shale development rights $ 8 $ 8 $ 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 $ 6,890 $ 6,890   6,724
Interstate natural gas transmission and storage assets | Minimum        
Property, Plant and Equipment [Line Items]        
Depreciable life 28 years 28 years    
Interstate natural gas transmission and storage assets | Maximum        
Property, Plant and Equipment [Line Items]        
Depreciable life 50 years 50 years    
Intangible plant        
Property, Plant and Equipment [Line Items]        
Utility plant in-service $ 80 $ 80   $ 79
Intangible plant | Minimum        
Property, Plant and Equipment [Line Items]        
Depreciable life 12 years 12 years    
Intangible plant | Maximum        
Property, Plant and Equipment [Line Items]        
Depreciable life 19 years 19 years