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Acquisitions - Thunderhead (Details) - Thunderhead Wind Energy LLC $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2019 MW | Feb. 19, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |
Capacity of generation unit | MW | 300 |  |
Duration of offtake agreement for the sale of energy produced | 12 years |  |
Bonus depreciation percentage | 100.00% |  |
WECI |  |  |
Business Acquisition [Line Items] |  |  |
Ownership interest in wind generating facility acquired | 80.00% |  |
Acquisition purchase price |  |  | $ 338
Subsequent event | WECI |  |  |
Business Acquisition [Line Items] |  |  |
Acquisition purchase price |  | $ 43 |
Additional ownership interest acquired |  | 10.00% |

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