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Business Acquisitions and Dispositions - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 14, 2021
Nov. 02, 2020
Nov. 01, 2020
Oct. 05, 2020
Nov. 06, 2019
Jul. 31, 2021
Nov. 30, 2020
Jul. 31, 2020
Jun. 30, 2015
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Jul. 03, 2020
Business Acquisition [Line Items]                          
Distribution of net assets                     $ 699    
Contributions                   $ 9      
Noncontrolling Interest                          
Business Acquisition [Line Items]                          
Contributions                   $ 9      
Iroquois Gas Transmission System, L.P.                          
Business Acquisition [Line Items]                          
Equity method investment, ownership percentage                   50.00%      
Natural Gas Transmission and Storage                          
Business Acquisition [Line Items]                          
Payments to acquire businesses     $ 2,500                    
Long-term debt, less current portion     $ 4,415                   $ 5,600
Natural Gas Transmission and Storage | Cove Point LNG, LP | Primary Beneficiary | Other Ownership Interest                          
Business Acquisition [Line Items]                          
Variable interest entity, ownership percentage     25.00%             25.00%      
Natural Gas Transmission and Storage | Cove Point LNG, LP | Primary Beneficiary | General Partner                          
Business Acquisition [Line Items]                          
Variable interest entity, ownership percentage     100.00%             100.00%      
Natural Gas Transmission and Storage | Cove Point LNG, LP | Primary Beneficiary | Limited Partner                          
Business Acquisition [Line Items]                          
Variable interest entity, ownership percentage     25.00%             25.00%      
Natural Gas Transmission and Storage | Iroquois Gas Transmission System, L.P.                          
Business Acquisition [Line Items]                          
Equity method investment, ownership percentage     50.00%                    
Questar Pipeline Group and Dominion Questar Transaction                          
Business Acquisition [Line Items]                          
Payments to acquire businesses $ 1,300 $ 1,300   $ 1,300                  
Long-term debt, less current portion       $ 430                  
EEGH                          
Business Acquisition [Line Items]                          
Contributions                   $ 419 $ 1,223 $ 3,385  
EEGH | Cove Point LNG, LP                          
Business Acquisition [Line Items]                          
Noncontrolling interest distributed               25.00%          
Ownership interest     25.00%           75.00% 75.00%      
EEGH | Cove Point LNG, LP | Primary Beneficiary | General Partner                          
Business Acquisition [Line Items]                          
Variable interest entity, ownership percentage                   100.00%      
EEGH | Cove Point LNG, LP | Primary Beneficiary | Limited Partner                          
Business Acquisition [Line Items]                          
Variable interest entity, ownership percentage                   25.00%      
EEGH | White River Hub, LLC                          
Business Acquisition [Line Items]                          
Ownership interest                 50.00%        
EEGH | Iroquois Gas Transmission System, L.P.                          
Business Acquisition [Line Items]                          
Ownership interest                 25.93%        
EEGH | GT&S Transaction | Disposed of by Means Other than Sale | Cove Point LNG, LP                          
Business Acquisition [Line Items]                          
Noncontrolling interest distributed           50.00%              
EEGH | Dominion Energy Questar Pipeline | Disposed of by Means Other than Sale                          
Business Acquisition [Line Items]                          
Distribution of net assets             $ 699            
Distribution of net assets of subsidiary to affiliate             41            
Contributions             1,300            
EEGH | Dominion Energy Questar Pipeline | Disposed of by Means Other than Sale | Goodwill                          
Business Acquisition [Line Items]                          
Distribution of net assets             185            
EEGH | Dominion Energy Questar Pipeline | Disposed of by Means Other than Sale | Pension Plan Asset                          
Business Acquisition [Line Items]                          
Distribution of net assets             895            
EEGH | Dominion Energy Questar Pipeline | Disposed of by Means Other than Sale | Affiliated Balances                          
Business Acquisition [Line Items]                          
Distribution of net assets             107            
EEGH | Cove Point LNG, LP | Noncontrolling Interest                          
Business Acquisition [Line Items]                          
Increase in noncontrolling interest             $ 2,800            
EEGH | Cove Point LNG, LP | GT&S Transaction | Disposed of by Means Other than Sale                          
Business Acquisition [Line Items]                          
Noncontrolling interest distributed             50.00%            
EEGH | White River Hub, LLC                          
Business Acquisition [Line Items]                          
Equity method investment, ownership percentage                   50.00%      
EEGH | Iroquois Gas Transmission System, L.P.                          
Business Acquisition [Line Items]                          
Equity method investment, ownership percentage                   50.00%      
Variable interest entity, ownership percentage                   50.00%      
Dominion Energy, Inc. | Cove Point LNG, LP                          
Business Acquisition [Line Items]                          
Retained interest after disposal             50.00%            
Ownership interest         25.00%   50.00%     50.00%      
Carolina Gas Transmission, LLC | Natural Gas Transmission and Storage                          
Business Acquisition [Line Items]                          
Ownership percentage acquired     100.00%                    
Eastern Gas Transmission, Inc. | Natural Gas Transmission and Storage                          
Business Acquisition [Line Items]                          
Ownership percentage acquired     100.00%