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Significant Financing Transactions (Narrative) (Details)
 1 Months Ended 3 Months Ended 9 Months Ended
Nov. 01, 2017
USD ($)
Apr. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
facility
Aug. 31, 2017
USD ($)
Jul. 31, 2017
shares
Jun. 30, 2017
USD ($)
agreement
May 31, 2017
USD ($)
Mar. 31, 2017
USD ($)
Jan. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
facility
shares
Sep. 30, 2016
shares
Sep. 30, 2017
USD ($)
facility
shares
Sep. 30, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]                            
Facility Limit     $ 5,500,000,000             $ 5,500,000,000   $ 5,500,000,000    
Short-term debt     3,060,000,000             3,060,000,000   3,060,000,000   $ 3,155,000,000 [1]
Issuance of common stock                       1,232,000,000 $ 2,079,000,000  
Shelf Registration for Sale of Common Stock through At-the-market Program                            
Debt Instrument [Line Items]                            
Number of sales agency agreements | agreement           3                
Issuance of common stock           $ 0                
Shelf Registration for Sale of Common Stock through At-the-market Program | Maximum                            
Debt Instrument [Line Items]                            
Sale of stock authorized amount           500,000,000                
2014 Equity Units                            
Debt Instrument [Line Items]                            
Issuance of common stock (in shares) | shares         12,500,000                  
Senior Notes, Due in 2019 | Senior Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt           $ 500,000,000     $ 400,000,000          
Interest rate percentage                 1.875%          
Debt maturity year           2019     2019          
Senior Notes, Due in 2022 | Senior Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt                 $ 400,000,000          
Interest rate percentage                 2.75%          
Debt maturity year                 2022          
Senior Notes, Due in 2024 | Senior Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt               $ 300,000,000            
Interest rate percentage               3.496%            
Debt maturity year               2024            
Senior Notes, Due in 2025 | Senior Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt               $ 100,000,000            
Interest rate percentage               3.90%            
Debt maturity year               2025            
Term Loan, Due in 2024                            
Debt Instrument [Line Items]                            
Borrowings under term loan agreement             $ 280,000,000              
Term loan, period of amortization             18 years              
Debt maturity month and year             2024-05              
Massachusetts Development Finance Agency Solid Waste Disposal Revenue Bonds, Series 2010B, Due in 2041                            
Debt Instrument [Line Items]                            
Debt maturity month and year       2041-12                    
Retirement of variable rate bonds       $ 75,000,000                    
Senior Notes Due in 2047 | Senior Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt     $ 550,000,000             $ 550,000,000   $ 550,000,000    
Interest rate percentage     3.80%             3.80%   3.80%    
Debt maturity year     2047                      
Senior Notes Due in 2023 | Senior Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt     $ 200,000,000             $ 200,000,000   $ 200,000,000    
Interest rate percentage     2.75%             2.75%   2.75%    
Debt maturity year     2023                      
Private Placement Senior Note Payable at 3.38% | Private Placement Senior Note Payable | Subsequent Event                            
Debt Instrument [Line Items]                            
Total Long-term Debt $ 100,000,000                          
Interest rate percentage 3.38%                          
Maturity period 15 years                          
Private Placement Senior Note Payable at 3.30% | Private Placement Senior Note Payable | Scenario, Forecast                            
Debt Instrument [Line Items]                            
Total Long-term Debt   $ 50,000,000                        
Interest rate percentage   3.30%                        
Maturity period   12 years                        
Private Placement Senior Note Payable at 3.97% | Private Placement Senior Note Payable | Scenario, Forecast                            
Debt Instrument [Line Items]                            
Total Long-term Debt   $ 100,000,000                        
Interest rate percentage   3.97%                        
Maturity period   30 years                        
Series A Remarketable Subordinated Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt             $ 1,000,000,000              
Interest rate percentage             1.50%              
Series A Remarketable Subordinated Notes | Junior Subordinated Notes                            
Debt Instrument [Line Items]                            
Interest rate percentage             2.579%              
Questar Gas | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million                            
Debt Instrument [Line Items]                            
Number of joint revolving credit facilities | facility     2             2   2    
Facility Limit     $ 250,000,000             $ 250,000,000   $ 250,000,000    
SBL Holdco | Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023                            
Debt Instrument [Line Items]                            
Facility Limit     30,000,000             30,000,000   $ 30,000,000    
Automatic renewal period                       1 year    
SBL Holdco | Credit Facilities, Maturing in December 2017 with 1 year Automatic Renewals through 2023 | Line of Credit                            
Debt Instrument [Line Items]                            
Short-term debt     0             0   $ 0    
Dominion Solar Projects III, Inc | Credit Facilities, Maturing in May 2018 with 1 year Automatic Renewals through 2024                            
Debt Instrument [Line Items]                            
Facility Limit     25,000,000             25,000,000   $ 25,000,000    
Automatic renewal period                       1 year    
Dominion Solar Projects III, Inc | Credit Facilities, Maturing in May 2018 with 1 year Automatic Renewals through 2024 | Line of Credit                            
Debt Instrument [Line Items]                            
Short-term debt     $ 0             $ 0   $ 0    
Virginia Electric and Power Company                            
Debt Instrument [Line Items]                            
Number of joint revolving credit facilities | facility     2             2   2    
Facility Limit [2]     $ 5,500,000,000             $ 5,500,000,000   $ 5,500,000,000    
Short-term debt     320,000,000             320,000,000   320,000,000   65,000,000 [3]
Credit facility     100,000,000             100,000,000   100,000,000    
Variable rate tax-exempt financings     $ 100,000,000             $ 100,000,000   $ 100,000,000    
Issuance of common stock (in shares) | shares                   0 0 0 0  
Virginia Electric and Power Company | Joint Revolving Credit Facility 5 Billion and Joint Revolving Credit Facility 500 Million                            
Debt Instrument [Line Items]                            
Facility Limit             $ 1,500,000,000 $ 2,000,000,000            
Virginia Electric and Power Company | Senior Notes, Due in 2027 | Senior Notes                            
Debt Instrument [Line Items]                            
Total Long-term Debt               $ 750,000,000            
Interest rate percentage               3.50%            
Dominion Energy Gas Holdings, LLC                            
Debt Instrument [Line Items]                            
Number of joint revolving credit facilities | facility     2             2   2    
Facility Limit [4]     $ 1,500,000,000             $ 1,500,000,000   $ 1,500,000,000    
Short-term debt     $ 620,000,000             $ 620,000,000   $ 620,000,000   $ 460,000,000 [5]
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] The full amount of the facilities is available to Virginia Power, less any amounts outstanding to co-borrowers Dominion Energy, Dominion Energy Gas and Questar Gas. Sub-limits for Virginia Power are set within the facility limit but can be changed at the option of the Companies multiple times per year. In May 2017, the aggregate sub-limit for Virginia Power was decreased from $2.0 billion to $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. These credit facilities mature in April 2020 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, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[4] A maximum of a combined $1.5 billion of the facilities is available to Dominion Energy Gas, assuming adequate capacity is available after giving effect to uses by co-borrowers Dominion Energy, Virginia Power and Questar Gas. Sub-limits for Dominion Energy Gas are set within the facility limit but can be changed at the option of the Companies multiple times per year. In May 2017, the aggregate sub-limit for Dominion Energy Gas was increased from $500 million to $750 million. If Dominion Energy Gas 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. These credit facilities mature in April 2020 and can be used to support bank borrowings and the issuance of commercial paper, as well as to support up to $1.5 billion (or the sub-limit, whichever is less) of letters of credit.
[5] Dominion Energy Gas’ Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.