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General - EEGH (Details) - EEGH - mi
1 Months Ended 6 Months Ended
Nov. 30, 2020
Jul. 31, 2020
Jun. 30, 2021
Cove Point LNG, LP      
Variable Interest Entity [Line Items]      
Percentage interest distributed   25.00%  
Cove Point LNG, LP | Not Discontinued Operations | GT&S Transaction      
Variable Interest Entity [Line Items]      
Percentage interest distributed 50.00%    
Iroquois Gas Transmission System, L.P.      
Variable Interest Entity [Line Items]      
Variable interest entity, ownership percentage     50.00%
Primary Beneficiary | General Partner | Cove Point LNG, LP      
Variable Interest Entity [Line Items]      
Variable interest entity, ownership percentage     100.00%
Primary Beneficiary | Limited Partner | Cove Point LNG, LP      
Variable Interest Entity [Line Items]      
Variable interest entity, ownership percentage     25.00%
Primary Beneficiary | Federal Energy Regulatory Commission | Iroquois Gas Transmission System, L.P.      
Variable Interest Entity [Line Items]      
Miles of interstate natural gas transportation pipeline     416