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v3.20.2

Investments Accounted for by the Equity Method and Variable Interest Entities - DGPV Holdco Consolidation (Details) $ in Millions |  | 9 Months Ended
--- | --- | ---
Nov. 02, 2020 USD ($) project fund MW | Sep. 30, 2020 USD ($) MW | Sep. 30, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Cash consideration to acquire membership interests | $ |  | $ 70 | $ 0
DGPV Holdco 3 |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Power generation capacity, megawatts | MW |  | 113 |
DGPV Holdco 3 | Subsequent Event |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Cash consideration to acquire membership interests | $ | $ 44 |  |
Number of tax equity funds | fund | 7 |  |
Number of solar projects | project | 172 |  |
Power generation capacity, megawatts | MW | 286 |  |

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