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Related Party Transactions - EEGH - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Feb. 28, 2021
Eastern Energy Gas Holdings, LLC [Member]        
Related Party Transaction [Line Items]        
Payments for distributions to affiliates $ 109,000,000 $ 269,000,000    
Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member]        
Related Party Transaction [Line Items]        
Expenses from transactions with related parties [1]   43,000,000    
Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Administrative And Technical Services [Member]        
Related Party Transaction [Line Items]        
Amounts of transaction 9,000,000      
Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Transportation And Storage Services [Member]        
Related Party Transaction [Line Items]        
Amounts of transaction 7,000,000      
Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Other Assets Due From Affiliates [Member]        
Related Party Transaction [Line Items]        
Amounts of transaction 6,000,000   $ 7,000,000  
Dominion Energy, Inc. [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member]        
Related Party Transaction [Line Items]        
Payments for distributions to affiliates   37,000,000    
Dominion Energy, Inc. [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Notes Receivable [Member]        
Related Party Transaction [Line Items]        
Interest income related to affiliated notes receivable   11,000,000    
East Ohio [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Notes Receivable [Member]        
Related Party Transaction [Line Items]        
Interest income related to affiliated notes receivable   $ 18,000,000    
Berkshire Hathaway Energy [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Tax Receivable [Member]        
Related Party Transaction [Line Items]        
Due from affiliates 21,000,000   20,000,000  
DEI, BHE, MidAmerican Energy, Northern Natural Gas and Other Related Parties [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Administrative And Technical Services [Member]        
Related Party Transaction [Line Items]        
Expenses from transactions with related parties 7,000,000      
BHE GT&S, LLC [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Intercompany Revolving Credit Agreement With BHE GT&S [Member]        
Related Party Transaction [Line Items]        
Maximum borrowing capacity 400,000,000      
BHE GT&S, LLC [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Intercompany Revolving Credit Agreement With BHE GT&S [Member] | Line of Credit [Member]        
Related Party Transaction [Line Items]        
Long-term line of credit 0   9,000,000  
Eastern Energy Gas Holdings, LLC [Member] | Affiliated Entity [Member] | BHE GT&S, LLC [Member] | BHE GT&S and Eastern Energy Intercompany Revolving Credit Agreement [Member]        
Related Party Transaction [Line Items]        
Long-term line of credit 234,000,000   124,000,000  
Face amount 400,000,000     $ 200,000,000
MidAmerican Energy Company [Member] | Affiliated Entity [Member] | Eastern Energy Gas Holdings, LLC [Member] | Shared Benefit Plan [Member]        
Related Party Transaction [Line Items]        
Due to related parties, noncurrent $ 110,000,000   $ 115,000,000  
[1] Includes capitalized expenditures of $3 million.