Capacity of facility of company owned solar distribution generation facilities.

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Number of solar development projects acquired.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The cash outflow from the amount invested for projects in hopes of getting a future return or interest from it.

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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