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Regulatory Matters (Narrative) (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
Oct. 31, 2017
USD ($)
program
Sep. 30, 2017
USD ($)
Aug. 31, 2017
USD ($)
kV
mi
Dec. 31, 2016
USD ($)
Rate
Nov. 30, 2016
USD ($)
Rate
Jun. 30, 2016
USD ($)
Nov. 30, 2013
kV
mi
Aug. 31, 2009
kV
Apr. 30, 2008
Apr. 30, 2007
kV
Jun. 30, 2017
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jul. 31, 2017
USD ($)
Dec. 31, 2014
MMBTU
Public Utilities, General Disclosures [Line Items]                                    
Regulatory assets-noncurrent     $ 2,503,000,000   $ 2,473,000,000 [1]                     $ 2,473,000,000 [1]    
Regulatory asset recovered through retail rates                                    
Public Utilities, General Disclosures [Line Items]                                    
Regulatory assets-noncurrent [2]     215,000,000   192,000,000                     192,000,000    
Virginia Electric and Power Company                                    
Public Utilities, General Disclosures [Line Items]                                    
ROE (percentage)                   11.40%                
Regulatory assets-noncurrent     838,000,000   770,000,000 [3]                     770,000,000 [3]    
Virginia Electric and Power Company | Regulatory asset recovered through retail rates                                    
Public Utilities, General Disclosures [Line Items]                                    
Regulatory assets-noncurrent [2]     215,000,000   $ 192,000,000                     192,000,000    
Virginia Electric and Power Company | FERC Gas Regulation | Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers | Unfavorable Regulatory Action | Settled Litigation                                    
Public Utilities, General Disclosures [Line Items]                                    
Amount required to pay under settlement agreement (in excess of $200 million)             $ 200,000,000                      
Duration of payment under settlement agreement             10 years                      
Amount of contingent liability     223,000,000                              
Virginia Electric and Power Company | FERC Gas Regulation | Order Regarding Transmission Rate Design for Allocation of Costs among PJM Interconnect LLC Transmission Customers | Unfavorable Regulatory Action | Settled Litigation | Regulatory asset recovered through retail rates                                    
Public Utilities, General Disclosures [Line Items]                                    
Regulatory assets-noncurrent     215,000,000                              
Virginia Electric and Power Company | Virginia Regulation                                    
Public Utilities, General Disclosures [Line Items]                                    
Obligated to make payments to fund improvements for historical and cultural resources                                 $ 90,000,000  
Payments made to fund improvement for historical and cultural resources.     70,000,000                              
Virginia Electric and Power Company | Virginia Regulation | Idylwood substation                                    
Public Utilities, General Disclosures [Line Items]                                    
Total estimated cost of project     $ 110,000,000                              
Virginia Electric and Power Company | Virginia Regulation | Transmission Line between Remington and Gordonsville Substations                                    
Public Utilities, General Disclosures [Line Items]                                    
Total estimated cost of project       $ 105,000,000                            
Length of kV line (miles) | mi       38                            
Capacity of transmission line (kV) | kV       230                            
Virginia Electric and Power Company | Virginia Regulation | Surry Switching Station Transmission Line                                    
Public Utilities, General Disclosures [Line Items]                                    
Length of kV line (miles) | mi               7                    
Capacity of transmission line (kV) | kV               500                    
Virginia Electric and Power Company | Virginia Regulation | Transmission Line from Skiffes Creek Switching Station to Wheaton Substation                                    
Public Utilities, General Disclosures [Line Items]                                    
Length of kV line (miles) | mi               20                    
Capacity of transmission line (kV) | kV               230                    
Virginia Electric and Power Company | Virginia Regulation | Subsequent Event                                    
Public Utilities, General Disclosures [Line Items]                                    
Payments made to fund improvement for historical and cultural resources.   $ 20,000,000                                
Virginia Electric and Power Company | Virginia Regulation | Rider U                                    
Public Utilities, General Disclosures [Line Items]                                    
ROE (percentage)     9.40%                              
Approved revenue required     $ 22,000,000                              
Projected capital investment     40,000,000                              
Virginia Electric and Power Company | Virginia Regulation | Riders C1A and C2A | Subsequent Event                                    
Public Utilities, General Disclosures [Line Items]                                    
Number of existing energy efficiency programs | program   1                                
Extension period for cost cap   5 years                                
Amount of cost recovery   $ 25,000,000                                
Proposed revenue requirement   31,000,000                                
Increase (decrease) in revenue requirement   3,000,000                                
Virginia Electric and Power Company | Virginia Regulation | Rider BW | Subsequent Event                                    
Public Utilities, General Disclosures [Line Items]                                    
Proposed revenue requirement   132,000,000                                
Increase (decrease) in revenue requirement   5,000,000                                
Virginia Electric and Power Company | Virginia Regulation | Rider US-2 | Subsequent Event                                    
Public Utilities, General Disclosures [Line Items]                                    
Proposed revenue requirement   15,000,000                                
Increase (decrease) in revenue requirement   5,000,000                                
Virginia Electric and Power Company | North Carolina Regulation | Annual Base Fuel Revenues                                    
Public Utilities, General Disclosures [Line Items]                                    
Increase (decrease) in revenue requirement       $ 15,000,000                            
Virginia Electric and Power Company | Minimum                                    
Public Utilities, General Disclosures [Line Items]                                    
Facility operating capacity (kV) | kV                 500   500              
DETI | FERC Gas Regulation | Supply Header Project | Atlantic Coast Pipeline                                    
Public Utilities, General Disclosures [Line Items]                                    
Agreement to provide Dths per day of transportation service | MMBTU                                   1,500,000
Annual transportation cost rate adjustment, approval amount requested to recover amount     39,000,000                              
Annual electric power cost rate adjustment, approval amount requested to recover amount     6,000,000                              
DETI | FERC Gas Regulation | Other Operations And Maintenance Expense | Preliminary recommendation one                                    
Public Utilities, General Disclosures [Line Items]                                    
Audit compliance charge recognized in connection with preliminary recommendation                       $ 15,000,000            
Audit compliance after-tax charge recognized in connection with preliminary recommendation                       9,000,000            
DETI | FERC Gas Regulation | Other Operations And Maintenance Expense | Other preliminary recommendation                                    
Public Utilities, General Disclosures [Line Items]                                    
Audit compliance charge recognized in connection with preliminary recommendation                       0            
Audit compliance after-tax charge recognized in connection with preliminary recommendation                       $ 0            
DETI | Minimum | FERC Gas Regulation | Supply Header Project | Atlantic Coast Pipeline                                    
Public Utilities, General Disclosures [Line Items]                                    
Total estimated cost of project     550,000,000                              
DETI | Maximum | FERC Gas Regulation | Supply Header Project | Atlantic Coast Pipeline                                    
Public Utilities, General Disclosures [Line Items]                                    
Total estimated cost of project     $ 600,000,000                              
East Ohio | Ohio Regulation | UEX Rider                                    
Public Utilities, General Disclosures [Line Items]                                    
Elimination of over-recovered balance of accumulated bad debt expense $ 12,000,000                                  
East Ohio | Ohio Regulation | UEX Rider | Scenario, Forecast                                    
Public Utilities, General Disclosures [Line Items]                                    
Prospective bad debt expense recovered                           $ 22,000,000        
Questar Gas | Utah and Wyoming Regulation | Subsequent Event                                    
Public Utilities, General Disclosures [Line Items]                                    
Proposed cost increase (decrease) amount   25,000,000                                
Hope Gas, Inc. | West Virginia Regulation | PREP                                    
Public Utilities, General Disclosures [Line Items]                                    
Projected capital investment                               $ 21,000,000    
Hope Gas, Inc. | West Virginia Regulation | PREP | Scenario, Forecast                                    
Public Utilities, General Disclosures [Line Items]                                    
Projected capital investment                         $ 31,000,000   $ 27,000,000      
Hope Gas, Inc. | West Virginia Regulation | Subsequent Event | PREP                                    
Public Utilities, General Disclosures [Line Items]                                    
Amount of cost recovery   $ 4,000,000                                
Cove Point | FERC Gas Regulation                                    
Public Utilities, General Disclosures [Line Items]                                    
Proposed revenue requirement           $ 140,000,000                        
Number of proposed rates to be effective | Rate           23                        
Number of proposed rates that were suspended | Rate         5                          
Cove Point | FERC Gas Regulation | Operating Revenue                                    
Public Utilities, General Disclosures [Line Items]                                    
Public utilities rate decrease amount       (18,000,000)                            
Cove Point | FERC Gas Regulation | Depreciation Expense                                    
Public Utilities, General Disclosures [Line Items]                                    
Public utilities rate decrease amount       $ (3,000,000)                            
[1] Dominion Energy’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] Reflects amounts related to the PJM transmission cost allocation matter. See Note 12 for more information.
[3] Virginia Power’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.