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Acquisitions and Dispositions (Narrative) (Details)
a in Thousands, $ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2017
MW
Mar. 31, 2017
USD ($)
project
Feb. 28, 2017
USD ($)
Aug. 31, 2016
project
Jan. 31, 2016
USD ($)
a
Dec. 31, 2015
USD ($)
project
Sep. 30, 2015
project
MW
Dec. 31, 2017
USD ($)
MW
Sep. 30, 2017
USD ($)
MW
Jun. 30, 2017
USD ($)
MW
Mar. 31, 2017
USD ($)
Mar. 31, 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                     $ 94 $ 0      
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                
Percentage of equity interest sold to noncontrolling interest owners   33.00%         33.00%       33.00%        
Number of solar projects | project             24                
Total number of solar projects related to potential sale | project           15                  
Amount of consideration         $ 117 $ 184                  
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                 $ 91        
Amount recognized in other income from sale   7                          
Amount to be recognized in other income ratably through 2023   $ 39                 $ 39        
Dominion 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                    
Development rights (number of acres) | a         2                   24
Number of natural gas storage fields | field                             1
Gain on sale of assets         $ 5                    
After tax gain on sale of assets         $ 3                    
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%        
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%    
Solar Projects from Cypress Creek Renewables, LLC | Scenario, Forecast                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Total 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%  
Total 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%                      
Total consideration   $ 77                          
Number of projects | project   1   2                      
Solar Frontier Americas Holding, LLC | Subsequent Event                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Additional MW capacity | MW 20                            
Solar Frontier Americas Holding, LLC | Scenario, Forecast                              
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                              
Cost of project                   $ 80          
MW capacity | MW                   30