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Provisions and Other Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2021
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] |
Summary of Provisions and Other Liabilities |
(CAD$ in millions) |  | December 31, 2021 |  | December 31, 2020 |  |
Decommissioning and restoration provisions and other provisions (a) |  | $ | 3,813 |  |  | $ | 3,484 |  |  |
Obligation to Neptune Bulk Terminals (b) |  | 170 |  |  | 111 |  |  |
Derivative liabilities (net of current portion of $9 (2020 – $6)) |  | 51 |  |  | 26 |  |  |
ENAMI preferential dividend liability (Note 10(a)) |  | 78 |  |  | 30 |  |  |
QB2 variable consideration to IMSA (Note 10(a)) |  | 98 |  |  | — |  |  |
Other IMSA payable |  | 61 |  |  | 60 |  |  |
Other liabilities |  | 83 |  |  | 20 |  |  |
|  | $ | 4,354 |  |  | $ | 3,731 |  |  |
a) Decommissioning and Restoration Provisions and Other Provisions
Summary of Movements in Provisions | The following table summarizes the movements in provisions for the year ended December 31, 2021:
(CAD$ in millions) |  | Decommissioning and Restoration Provisions |  | Other Provisions |  | Total
As at January 1, 2021 |  | $ | 3,342 |  |  | $ | 315 |  |  | $ | 3,657 |
Settled during the year |  | (90) |  |  | (38) |  |  | (128) |
Change in discount rate |  | 322 |  |  | — |  |  | 322 |
Change in amount and timing of cash flows |  | 2 |  |  | 75 |  |  | 77 |
Accretion (Note 9) |  | 151 |  |  | 4 |  |  | 155 |
Other |  | (4) |  |  | (56) |  |  | (60) |
Changes in foreign exchange rates |  | 2 |  |  | (2) |  |  | — |
As at December 31, 2021 |  | 3,725 |  |  | 298 |  |  | 4,023 |
Less current portion of provisions (Note 17) |  | (144) |  |  | (66) |  |  | (210) |
Long-term provisions |  | $ | 3,581 |  |  | $ | 232 |  |  | $ | 3,813 |

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