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Significant Financing Transactions (Narrative) (Detail)
1 Months Ended 2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 14, 2019
USD ($)
$ / shares
shares
Jun. 30, 2022
shares
Jul. 31, 2019
USD ($)
May 31, 2019
USD ($)
Bond
Mar. 31, 2019
USD ($)
Feb. 28, 2019
USD ($)
Jan. 31, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Apr. 30, 2018
shares
Apr. 30, 2018
shares
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
shares
Jun. 30, 2019
USD ($)
shares
Jun. 30, 2018
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Debt Instrument [Line Items]                                
Facility Limit [1]                     $ 6,000,000,000     $ 6,000,000,000    
Short-term debt                     2,547,000,000     2,547,000,000   $ 334,000,000
Repayment of long-term debt                           $ 3,378,000,000 $ 2,840,000,000  
Tender offer expiration description                           Both DESC tender offers and the SCANA tender offer expired in the first quarter of 2019.    
Number of shares received | shares               26,700,000         26,700,000   26,700,000  
Increase (decrease) Non-controlling interest               $ 375,000,000                
Shares of common stock issued in acquisition, value                           $ 6,818,000,000    
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities                           (40,000,000)    
Cash proceeds received from common stock                           325,000,000 $ 662,000,000  
Issuance costs $ 28,000,000                              
Issuance of common stock value                     $ 1,674,000,000   $ 82,000,000 $ 1,921,000,000 $ 662,000,000  
Shelf Registration For Sale Of Common Stock Through At Market Program                                
Debt Instrument [Line Items]                                
Issuance of common stock (in shares) | shares                           2,100,000    
Cash proceeds received from common stock                           $ 154,000,000    
Issuance costs                           2,000,000    
Issuance of common stock value                           $ 645,000,000    
Common Stock                                
Debt Instrument [Line Items]                                
Shares of common stock issued in acquisition | shares                           96,000,000    
Shares of common stock issued in acquisition, value                           $ 6,818,000,000    
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities                           $ 1,181,000,000    
Issuance of common stock (in shares) | shares                     1,000,000   1,000,000 4,000,000 9,000,000  
Issuance costs 14,000,000                              
Issuance of common stock value                     $ 78,000,000   $ 82,000,000 $ 325,000,000 $ 662,000,000  
Common Stock | Forward Sale Agreements                                
Debt Instrument [Line Items]                                
Cash proceeds received from common stock                               $ 1,400,000,000
Issuance of shares of common stock under forward equity sale agreement | shares                   20,000,000            
Common Stock | Underwriters Option to Purchase | Forward Sale Agreements                                
Debt Instrument [Line Items]                                
Issuance of common stock (in shares) | shares                               22,100,000
Period to purchase common stock under option                   30 days            
Issuance of shares of common stock under option to purchase | shares                 2,100,000              
Common Stock | Maximum | Underwriters Option to Purchase | Forward Sale Agreements                                
Debt Instrument [Line Items]                                
Issuance of shares of common stock under option to purchase | shares                   3,000,000            
2019 Corporate Units                                
Debt Instrument [Line Items]                                
Total Long-term Debt $ 1,600,000,000                              
Percentage of interest in undivided beneficial ownership 10.00%                              
Issuance of common stock (in shares) | shares 16,000,000                              
2019 Corporate Units | Scenario Forecast | Maximum                                
Debt Instrument [Line Items]                                
Shares to be issued under purchase contracts | shares   21,800,000                            
2019 Corporate Units | Common Stock                                
Debt Instrument [Line Items]                                
Purchase price to be paid under stock purchase contracts | $ / shares $ 100                              
June 2006 Hybrids                                
Debt Instrument [Line Items]                                
Debt, amount redeemed                     12,000,000     12,000,000    
September 2006 Hybrids                                
Debt Instrument [Line Items]                                
Debt, amount redeemed                     13,000,000     13,000,000    
Dominion Energy Midstream Partners, LP                                
Debt Instrument [Line Items]                                
Repayment of long-term debt           $ 73,000,000                    
Shares of common stock issued in acquisition | shares             22,500,000                  
Shares of common stock issued in acquisition, value             $ 1,600,000,000                  
Right to receive conversion of common stock | shares             0.2492                  
Gain or loss recognized in equity transaction             $ 0                  
Amount of income taxes recognized in equity primarily attributable to establishing additional regulatory liabilities             $ 40,000,000                  
Virginia Electric and Power Company                                
Debt Instrument [Line Items]                                
Facility Limit [2]                     6,000,000,000     6,000,000,000    
Short-term debt                     $ 1,300,000,000     1,300,000,000   $ 314,000,000 [3]
Repayment of long-term debt                           $ 589,000,000 $ 951,000,000  
Issuance of common stock (in shares) | shares                     0   0 0 0  
Virginia Electric and Power Company | Tax Exempt Bonds                                
Debt Instrument [Line Items]                                
Number of series of tax exempt bonds | Bond       4                        
Aggregate outstanding principal amount       $ 198,000,000                        
DESC                                
Debt Instrument [Line Items]                                
Line of credit sub-limit                     $ 500,000,000     $ 500,000,000    
Repurchase of first mortgage bonds                       $ 1,200,000,000        
SCANA                                
Debt Instrument [Line Items]                                
Repurchase of medium term notes         $ 300,000,000                      
Shares of common stock issued in acquisition | shares             95,600,000                  
Shares of common stock issued in acquisition, value             $ 6,800,000,000                  
Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | SBL Holdco                                
Debt Instrument [Line Items]                                
Facility Limit                     30,000,000     $ 30,000,000    
Automatic renewal period                           1 year    
Short-term debt                     0     $ 0    
Credit Facilities, Maturing in May 2018 with 1 year Automatic Renewals through 2024 | Dominion Solar Projects III, Inc                                
Debt Instrument [Line Items]                                
Facility Limit                     25,000,000     $ 25,000,000    
Automatic renewal period                           1 year    
Short-term debt                     0     $ 0    
Variable Rate Term Loan | Dominion Energy Midstream Partners, LP                                
Debt Instrument [Line Items]                                
Repayment of long-term debt           300,000,000                    
Senior Notes, Due in 2049 | Senior Notes                                
Debt Instrument [Line Items]                                
Total Long-term Debt         $ 400,000,000             $ 400,000,000        
Interest rate percentage         4.60%             4.60%        
Debt maturity year         2049                      
Senior Notes, Due in 2028 | Senior Notes                                
Debt Instrument [Line Items]                                
Total Long-term Debt         $ 200,000,000             $ 200,000,000        
Interest rate percentage         4.25%             4.25%        
Debt maturity year         2028                      
Senior Notes, Due in 2024 | Senior Notes                                
Debt Instrument [Line Items]                                
Total Long-term Debt       $ 33,000,000                        
Interest rate percentage       5.49%                        
Debt maturity year       2024                        
1.8% Tax-Exempt Bond | Virginia Electric and Power Company | Tax Exempt Bonds                                
Debt Instrument [Line Items]                                
Interest rate percentage       1.80%                        
Number of series of tax exempt bonds | Bond       1                        
1.9% Tax-Exempt Bond | Virginia Electric and Power Company | Tax Exempt Bonds                                
Debt Instrument [Line Items]                                
Interest rate percentage       1.90%                        
Number of series of tax exempt bonds | Bond       3                        
Senior Notes, Due in 2029 | Senior Notes                                
Debt Instrument [Line Items]                                
Interest rate percentage     2.875%                          
Debt maturity year     2029                          
Senior Notes, Due in 2029 | Tax Exempt Bonds                                
Debt Instrument [Line Items]                                
Total Long-term Debt     $ 500,000,000                          
Remarketable Subordinated Notes, 2016 Series A-1, due 2021 | Capital Unit, Class A                                
Debt Instrument [Line Items]                                
Total Long-term Debt                     $ 700,000,000     $ 700,000,000    
Interest rate percentage                     2.00%     2.00%    
Remarketable Subordinated Notes, 2016 Series A-2, due 2024 | Capital Unit, Class B                                
Debt Instrument [Line Items]                                
Total Long-term Debt                     $ 700,000,000     $ 700,000,000    
Interest rate percentage                     2.00%     2.00%    
Series A-1 Junior Subordinated Notes | Unsecured Junior Subordinated Notes                                
Debt Instrument [Line Items]                                
Interest rate percentage                     2.715%     2.715%    
Series A-2 Junior Subordinated Notes | Unsecured Junior Subordinated Notes                                
Debt Instrument [Line Items]                                
Interest rate percentage                     3.071%     3.071%    
Letter of Credit                                
Debt Instrument [Line Items]                                
Facility Limit                     $ 2,000,000,000.0     $ 2,000,000,000.0    
Letter of Credit | Virginia Electric and Power Company                                
Debt Instrument [Line Items]                                
Facility Limit                     2,000,000,000.0     2,000,000,000.0    
Letter of Credit | DESC                                
Debt Instrument [Line Items]                                
Terminated credit facility         $ 700,000,000                      
Letter of Credit | Credit Facility, Maturing in June 2020                                
Debt Instrument [Line Items]                                
Facility Limit                     21,000,000     21,000,000    
Credit facility, outstanding amount                     $ 11,000,000     $ 11,000,000    
Line of credit facility, termination date                           Jun. 30, 2020    
Revolving Credit Facility | Dominion Energy Midstream Partners, LP                                
Debt Instrument [Line Items]                                
Terminated credit facility           $ 500,000,000                    
Economic Development Authority of the County of Chesterfield Pollution Control Refunding Revenue Bonds, Series 2009A, due in 2023 | Virginia Electric and Power Company                                
Debt Instrument [Line Items]                                
Interest rate percentage       5.00%                        
Debt, amount redeemed       $ 40,000,000                        
[1] This credit facility matures in March 2023 and can be used by the borrowers under the credit facility to support bank borrowings and the issuance of commercial paper, as well as to support up to a combined $2.0 billion of letters of credit.
[2] The full amount of the facility is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas, Questar Gas and DESC. The sub-limit for Virginia Power is set within the facility limit but can be changed at the option of the borrowers under the credit facility multiple times per year. At June 30, 2019, the sub-limit for Virginia Power was $1.5 billion. If Virginia Power has liquidity needs in excess of its sub-limit, the sub-limit may be changed or such needs may be satisfied through short-term intercompany borrowings from Dominion Energy. This credit facility matures in March 2023 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $2.0 billion (or the sub-limit, whichever is less) of letters of credit.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2018 has been derived from the audited Consolidated Balance Sheet at that date.