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Capitalization - Additional Information (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) | Feb. 28, 2021 USD ($) project
Borrowings Due 2028 | Clean Energy Businesses |  |
Schedule of Capitalization [Line Items] |  |
Face amount of debt |  | $ 250,000,000
Number of solar electric production projects | project |  | 4
Interest rate |  | 3.39%
Tax Equity Financing Agreement | Clean Energy Businesses |  |
Schedule of Capitalization [Line Items] |  |
Face amount of debt |  | $ 270,000,000
Number of solar electric production projects | project |  | 3
Amount funded from tax equity financing agreement | $ 39,000,000 |
Senior Notes | 3.77% Senior Notes Due 2046 | Clean Energy Businesses |  |
Schedule of Capitalization [Line Items] |  |
Face amount of debt | $ 229,000,000 |
Interest rate | 3.77% |
Term Loan | Term Loan Due June 2021 |  |
Schedule of Capitalization [Line Items] |  |
Prepayment of debt | $ 675,000,000 |

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