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Acquisitions and Dispositions (Merchant Solar Projects) (Narrative) (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 31, 2017
USD ($)
project
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
project
MW
May 31, 2017
USD ($)
project
Apr. 30, 2017
MW
Mar. 31, 2017
USD ($)
project
Feb. 28, 2017
USD ($)
Aug. 31, 2016
project
Dec. 31, 2015
USD ($)
project
Sep. 30, 2015
project
MW
Dec. 31, 2017
USD ($)
MW
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
MW
Jan. 31, 2017
Jan. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                
Cost of project                       $ 343 $ 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                 $ 184             $ 117
Merchant Solar Projects | Disposal Group, Disposed of by Sale, Not Discontinued Operations | SunEdison, 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%            
Terra Nova Renewable Partners | 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]                                
Percentage of equity interest sold to noncontrolling interest owners   33.00%                   33.00%        
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%  
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%                        
Number of projects | project       2                        
Cash consideration       $ 56                        
Two Solar Projects from Hecate Energy Virginia C&C LLC | Scenario, Forecast                                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                
Cost of project                           $ 60    
MW capacity | MW                           30    
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                          
Second 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   $ 40                            
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%                          
Cash consideration     $ 40                          
Number of projects | project     4                          
Four Solar Projects from Strata Solar Development, LLC and Moorings Farm 2 Holdco, LLC | Scenario, Forecast                                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                
Cost of project                           $ 45    
MW capacity | MW                           19    
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                          
Final Two Solar Projects from Strata Solar Development, LLC and Moorings Farm 2 Holdco, LLC | Subsequent Event                                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                                
Cash consideration $ 20                              
Number of projects | project 2