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Acquisitions and Dispositions (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
project
MW
May 31, 2017
USD ($)
project
MW
Apr. 30, 2017
MW
Mar. 31, 2017
USD ($)
project
Feb. 28, 2017
USD ($)
Aug. 31, 2016
project
Apr. 30, 2016
USD ($)
a
Jan. 31, 2016
USD ($)
a
Dec. 31, 2015
USD ($)
project
Sep. 30, 2015
project
MW
Mar. 31, 2015
a
Dec. 31, 2013
USD ($)
a
field
Dec. 31, 2017
USD ($)
MW
Jun. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jan. 31, 2017
Sep. 30, 2016
Nov. 30, 2014
a
field
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Cost of project                             $ 280 $ 10      
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Shale development rights                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Amount of consideration               $ 5       $ 200              
Development rights (number of acres) | a               2,000       79,000             24,000
Number of natural gas storage fields | field                       1             1
Period for payments related to conveyance of natural gas storage fields                       9 years              
Gain on sale of assets               $ 5                      
After tax gain on sale of assets               3                      
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Shale development rights | Amended Agreement to Extend Conveyance of Development Rights                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Development rights (number of acres) | a             70,000       9,000                
Period for payments related to conveyance of natural gas storage fields                     2 years                
Partial interest percentage conveyed             32.00%                        
Dominion Energy Gas Holdings, LLC | Marcellus Shale | Shale development rights | Amended Agreement to Extend Conveyance of Development Rights | Other Operations And Maintenance Expense                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Revenue recognized             $ 35                        
Revenue recognized net of tax             $ 21                        
Merchant Solar Projects | Disposal Group, Disposed of by Sale, Not Discontinued Operations                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
MW capacity | MW                   425                  
Number of solar projects | project                   24                  
Total number of solar projects related to potential sale | project                 15                    
Amount of consideration               $ 117 $ 184                    
Merchant Solar Projects | Disposal Group, Disposed of by Sale, Not Discontinued Operations | NRG Energy, Inc                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Percentage of equity interest sold to noncontrolling interest owners 33.00%                 33.00%       33.00% 33.00%        
Assignment of Tower Rental Portfolio | Disposal Group, Disposed of by Sale, Not Discontinued Operations                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Amount of consideration       $ 91                              
Amount recognized in other income from sale                           $ 1 $ 8        
Amount to be recognized in other income ratably through 2023 $ 38                         $ 38 $ 38        
Terra Nova Renewable Partners | Call Option | Merchant Solar Projects                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Percentage ownership in total units 67.00%                         67.00% 67.00%        
Solar Projects from Cypress Creek Renewables, LLC                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Percentage of equity interests acquired                                 100.00%    
Cash consideration   $ 154                                  
Cost of project $ 160                                    
MW capacity | MW 79                                    
Community Energy Solar, LLC                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Percentage of equity interests acquired                                   100.00%  
Cash consideration         $ 29                            
Community Energy Solar, LLC | Scenario, Forecast                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Cost of project                         $ 205            
MW capacity | MW                         100            
Solar Frontier Americas Holding, LLC                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Percentage of equity interests acquired           100.00%                          
Cash consideration       $ 77                              
Cost of project $ 78                                    
MW capacity | MW 30                                    
Number of projects | project       1   2                          
Discontinued efforts on acquisition of additional MW capacity | MW     20                                
Two Solar Projects from Hecate Energy Virginia C&C LLC                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Percentage of equity interests acquired   100.00%                                  
Cash consideration   $ 56                                  
Cost of project   $ 60                                  
MW capacity | MW   30                                  
Number of projects | project   2                                  
One Solar Projects from Hecate Energy Virginia C&C LLC                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Cash consideration $ 16                                    
Number of projects | project 1                                    
Four Solar Projects from Strata Solar Development, LLC and Moorings Farm 2 Holdco, LLC                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Percentage of equity interests acquired 100.00%                         100.00% 100.00%        
Cash consideration $ 40                                    
Cost of project $ 45                                    
MW capacity | MW 19                                    
Number of projects | project 4                                    
Two Solar Projects from Strata Solar Development, LLC and Moorings Farm 2 Holdco, LLC                                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                      
Cash consideration $ 20                                    
Number of projects | project 2