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Business Acquisitions - Narrative (Details) $ in Millions, $ in Millions | Nov. 05, 2021 USD ($) MW | Nov. 05, 2021 CAD ($) | Feb. 26, 2021 CAD ($)
--- | --- | --- | ---
TransAlta Renewables Inc. |  |  |
Investment [Line Items] |  |  |
Aggregate consideration |  |  | $ 213
North Carolina Solar | TransAlta Renewables Inc. |  |  |
Investment [Line Items] |  |  |
Membership interest | 100.00% |  |
North Carolina Solar |  |  |
Investment [Line Items] |  |  |
Membership interest | 100.00% |  |
Capacity of facility (in megawatts) | MW | 122,000,000 |  |
Cash consideration | $ 99 |  |
Aggregate consideration |  | $ 123 |
North Carolina Solar | Entities with joint control or significant influence over entity |  |  |
Investment [Line Items] |  |  |
Aggregate consideration | $ 102 |  |

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