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Acquisitions and Dispositions (Narrative) (Detail) $ in Millions	1 Months Ended		3 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) Project	Jun. 30, 2015 USD ($) Project MW	Sep. 30, 2016 USD ($) MW	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Project Cost				$ 151	$ 405	$ 40
Four Brothers Solar, LLC
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired		50.00%
Number of Projects | Project		4
Purchase price		$ 64
MW capacity | MW		320
Project Cost			$ 670
Three Cedars
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired	50.00%
Number of Projects | Project	3
Purchase price	$ 43
MW capacity | MW			210
Project Cost			$ 450
Four Brothers and Three Cedars | Investment Credits | IRS
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of federal investment tax credits on projects claimed				99.00%
NRG Energy, Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contributions from SunEdison and NRG to Four Brothers and Three Cedars					9
NRG Energy, Inc | Four Brothers and Three Cedars
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Percentage of equity interests acquired							50.00%
Sun Edison Inc
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contributions from SunEdison and NRG to Four Brothers and Three Cedars						$ 189
Sun Edison Inc | Four Brothers and Three Cedars
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Contributions from SunEdison and NRG to Four Brothers and Three Cedars					$ 301

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