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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Restrictions on Non-Recourse Debt and Security (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 20, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Debentures issued | $ 350 |  |  |
Other borrowings | 326 | $ 0 |  |
Borrowings | 3,212 | 3,267 |  |
Property, plant and equipment | 6,207 | 6,164 |  | $ 6,578
Bonds issued |  |  | $ 345 |
Non-recourse debt |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Other borrowings | 1,143 | 1,235 |  |
Restricted cash (Note 22) | 42 | 33 |  |
Renewable generation facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Property, plant and equipment | $ 967 | $ 1,021 |  |

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