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Acquisitions and Dispositions (Merchant Solar Projects) (Narrative) (Detail) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) Project MW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Project Cost | $ 341 | $ 151 | $ 405 |
Solar Development Projects |  |  |  |
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 |  |  |  | 7
Aggregate purchase price |  |  |  | $ 32
Project Cost |  |  |  | $ 421
MW capacity | MW |  |  |  | 221

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