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Business Combination Disclosure Business Combination Disclosure (Details) - Subsequent Event [Member]
$ in Millions
Nov. 01, 2020
USD ($)
mi
Bcf
Oct. 29, 2020
USD ($)
Oct. 05, 2020
USD ($)
Natural Gas Transmission and Storage Transaction [Member]      
Business Acquisition [Line Items]      
Miles of natural gas transmission lines | mi 5,700    
Natural gas transmission lines transportation per day capacity | Bcf 13.9    
Natural gas operated storage capacity | Bcf 733    
Natural gas company-owned working storage capacity | Bcf 299    
Liquefied natural gas storage capacity | Bcf 14.6    
Payments to Acquire Businesses, Gross $ 2,700    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt $ 5,300    
Natural Gas Transmission and Storage Transaction [Member] | Iroquois Gas Transmission System L.P. [Member]      
Business Acquisition [Line Items]      
Equity Method Investment, Ownership Percentage 50.00%    
Natural Gas Transmission and Storage Transaction [Member] | Cove Point LNG, LP [Member]      
Business Acquisition [Line Items]      
Equity Method Investment, Ownership Percentage 25.00%    
General Partnership Interest 100.00%    
Natural Gas Transmission and Storage Business Acquisition [Member]      
Business Acquisition [Line Items]      
Preferred Stock, Value, Issued   $ 3,750  
Preferred Stock, Dividend Rate, Percentage   4.00%  
Natural Gas Transmission and Storage Business Acquisition [Member] | Forecast [Member]      
Business Acquisition [Line Items]      
Approval period, days following purchase agreement execution     75 days
Natural Gas Transmission and Storage Business Acquisition [Member] | Eastern Gas Transmission, Inc. [Member]      
Business Acquisition [Line Items]      
Ownership Percentage Acquired 100.00%    
Natural Gas Transmission and Storage Business Acquisition [Member] | Carolina Gas Transmission, LLC [Member]      
Business Acquisition [Line Items]      
Ownership Percentage Acquired 100.00%    
Questar Pipeline Group and Dominion Questar Transaction [Member] | Forecast [Member]      
Business Acquisition [Line Items]      
Payments to Acquire Businesses, Gross     $ 1,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt     $ 430