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Business Combination Disclosure Business Combination Disclosure (Details) - Natural Gas Transmission and Storage Business Acquisition [Member] - Forecast [Member] - Subsequent Event [Member]
$ in Billions
Jul. 03, 2020
USD ($)
mi
Bcf
Business Acquisition [Line Items]  
Miles of natural gas transmission lines | mi 7,700
Natural gas transmission lines transportation per day capacity 20.8
Natural gas operated storage capacity 900
Natural gas company-owned working storage capacity 364
Liquefied natural gas storage capacity 14.6
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ $ 9.7
Payments to Acquire Businesses, Gross | $ 4.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $ $ 5.7
Approval period, days following purchase agreement execution 75 days
Iroquois Gas Transmission System L.P. [Member]  
Business Acquisition [Line Items]  
Equity Method Investment, Ownership Percentage 50.00%
Dominion Energy Cove Point LNG, LP [Member]  
Business Acquisition [Line Items]  
Equity Method Investment, Ownership Percentage 25.00%
General Partnership Interest 100.00%
Dominion Energy Transmission, Inc. [Member]  
Business Acquisition [Line Items]  
Ownership Percentage Acquired 100.00%
Dominion Energy Carolina Gas Transmission, LLC [Member]  
Business Acquisition [Line Items]  
Ownership Percentage Acquired 100.00%
Dominion Energy Questar Pipeline [Member]  
Business Acquisition [Line Items]  
Ownership Percentage Acquired 100.00%