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Decommissioning and Other Provisions - Current and Non-Current Portion of Decommissioning and Other Provisions (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Balance | $ 827 | $ 673 | $ 546
Current portion | 48 | 59 |
Non-current portion | 779 | 614 |
Decommissioning and restoration |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 793 | 608 | 501
Current portion | 35 | 21 |
Non-current portion | 758 | 587 |
Other provisions |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 34 | 65 | $ 45
Current portion | 13 | 38 |
Non-current portion | $ 21 | $ 27 |

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