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Noncontrolling Interests - EEGH (Details)
shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Nov. 06, 2019
Nov. 30, 2020
Dec. 31, 2019
Jan. 31, 2019
USD ($)
shares
Dec. 31, 2021
Noncontrolling Interest [Line Items]          
Convertible subordinated units, conversion ratio         1
Dominion Energy, Inc. | Cove Point LNG, LP          
Noncontrolling Interest [Line Items]          
Ownership interest 25.00% 50.00%     50.00%
Dominion Energy, Inc. | Northeast Midstream          
Noncontrolling Interest [Line Items]          
Additional shares issued to parent (in shares) | shares       22.5  
Additional shares issued to parent, value amount       $ 1,600  
Income tax effects allocated directly to equity       $ 40  
Brookfield Super-Core Infrastructure Partners | Cove Point LNG, LP          
Noncontrolling Interest [Line Items]          
Ownership interest     25.00%   25.00%
Northeast Midstream          
Noncontrolling Interest [Line Items]          
Preferred unit, exchange ratio       0.2492