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Exchangeable Securities - Schedule of Exchangeable Securities (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | May 01, 2019
--- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |
Credit facilities, long-term debt, and finance lease obligations | $ 2,423 | $ 3,256 |
7% Unsecured Subordinated Debentures Due May 1, 2039 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notes and debentures issued | $ 350 | $ 350 |
Interest rate | 7.00% | 7.00% | 7.00%
Exchangeable Preferred Shares | $ 400 | $ 400 |
Credit facilities, long-term debt, and finance lease obligations | 750 | 750 |
Gross carrying amount | 7% Unsecured Subordinated Debentures Due May 1, 2039 |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Notes and debentures issued | 335 | 330 |
Exchangeable Preferred Shares | 400 | 400 |
Credit facilities, long-term debt, and finance lease obligations | $ 735 | $ 730 |

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