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Business Acquisitions and Divestitures - Fair values of the identifiable assets and liabilities of the acquired entity in the business combination (Details) - CAD ($) $ in Millions | Nov. 05, 2021 | May 19, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of detailed information about business combination [line items] |  |  |  |  |
Right-of-use assets |  |  | $ 95 | $ 141 | $ 146
North Carolina Solar |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Cash and cash equivalents | $ 4 |  |  |  |
Accounts receivable | 4 |  |  |  |
Property, plant and equipment | 146 |  |  |  |
Right-of-use assets | 13 |  |  |  |
Accounts payable and accrued liabilities | (4) |  |  |  |
Lease liabilities | (13) |  |  |  |
Tax equity liability | (20) |  |  |  |
Deferred taxes | (3) |  |  |  |
Decommissioning provisions | (4) |  |  |  |
Net assets acquired | 123 |  |  |  |
Aggregate value of business combination | 120 |  |  |  |
Working capital consideration | 3 |  |  |  |
Consideration received | $ 123 |  |  |  |
Ada Facility |  |  |  |  |
Disclosure of detailed information about business combination [line items] |  |  |  |  |
Cash and cash equivalents |  | $ 1 |  |  |
Accounts receivable |  | 3 |  |  |
Property, plant and equipment |  | 1 |  |  |
Intangible assets |  | 37 |  |  |
Inventory recognised as of acquisition date |  | 1 |  |  |
Prepaid Expense Recognised As Of Acquisition Date |  | 1 |  |  |
Current Derivative Financial Liabilities Recognised As Of Acquisition Date |  | (5) |  |  |
Decommissioning provisions |  | (1) |  |  |
Net assets acquired |  | 38 |  |  |
Aggregate value of business combination |  | 32 |  |  |
Working capital consideration |  | 6 |  |  |
Consideration received |  | $ 38 |  |  |

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- Definition The amount recognised as of the acquisition date for cash and cash equivalents acquired in a business combination. [Refer: Cash and cash equivalents; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount recognised as of the acquisition date for deferred tax liabilities assumed in a business combination. [Refer: Deferred tax liabilities; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2021-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2021-en-r&anchor=para_B64_i&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_53_j&doctype=Standard -URIDate 2021-03-24 + Details
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