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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 |  |  |  |  |

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