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Provisions and Other Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2020
Other Provisions, Contingent Liabilities And Contingent Assets [Abstract] |
Summary of Provisions and Other Liabilities |
(CAD$ in millions) |  | December 31, 2020 |  | December 31, 2019
Provisions (a) |  | $ | 3,484 |  |  | $ | 2,345 |
Obligation to Neptune Bulk Terminals (b) |  | 111 |  |  | — |
Derivative liabilities (net of current portion of $6 (2019 - $2)) |  | 26 |  |  | 31 |
ENAMI preferential dividend |  | 30 |  |  | 82 |
IMSA payable |  | 60 |  |  | 58 |
Other |  | 20 |  |  | 20 |
|  | $ | 3,731 |  |  | $ | 2,536 |
Summary of Movements in Provisions | The following table summarizes the movements in provisions for the year ended December 31, 2020:
(CAD$ in millions) |  | Decommissioning and Restoration Provisions |  | Other |  | Total
As at January 1, 2020 |  | $ | 2,234 |  |  | $ | 236 |  |  | $ | 2,470 |
Settled during the year |  | (58) |  |  | (39) |  |  | (97) |
Change in discount rate |  | 649 |  |  | — |  |  | 649 |
Change in amount and timing of cash flows |  | 390 |  |  | 116 |  |  | 506 |
Accretion (Note 10) |  | 114 |  |  | 4 |  |  | 118 |
Other |  | 18 |  |  | — |  |  | 18 |
Changes in foreign exchange rates |  | (5) |  |  | (2) |  |  | (7) |
As at December 31, 2020 |  | 3,342 |  |  | 315 |  |  | 3,657 |
Less current portion of provisions (Note 18) |  | (124) |  |  | (49) |  |  | (173) |
Long-term provisions |  | $ | 3,218 |  |  | $ | 266 |  |  | $ | 3,484 |

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