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Variable Interest Entities - Additional Information (Details) - Variable Interest Entity, Primary Beneficiary $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 MW
Texas Solar 4 |  |  |
Variable Interest Entity [Line Items] |  |  |
Generating capacity (MW AC) | MW |  |  | 40
Tax Equity Projects |  |  |
Variable Interest Entity [Line Items] |  |  |
Net income (loss) | $ (14) | $ (19) |
Income (loss) before tax | $ (10) | (14) |
Con Edison Development | Texas Solar 4 |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage of variable interests (less than) |  |  | 80.00%
Ownership percentage acquired | 20.00% |  |
Con Edison Development | Tax Equity Projects |  |  |
Variable Interest Entity [Line Items] |  |  |
Percentage of variable interests (less than) |  |  | 100.00%
Tax Equity Investors | Tax Equity Projects |  |  |
Variable Interest Entity [Line Items] |  |  |
Net income (loss) | $ 17 | 21 |
Income (loss) before tax | $ 13 | $ 16 |

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- Definition Variable Interest Entity, Measure Of Activity, Net Income (Loss) + References No definition available. + Details
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- Definition Description of the amount of pre-tax income (loss) derived by the reporting entity from the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph d -URI http://asc.fasb.org/extlink&oid=118582676&loc=d3e5747-111685 + Details
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- Definition 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. + References No definition available. + Details
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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685 + Details
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