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Decommissioning and Other Provisions - Current and Non-Current Portion of Decommissioning and Other Provisions (Details) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Balance | CAD 470 | CAD 343 | CAD 398
Current portion | 67 | 39 |
Non-current portion | 403 | 304 |
Decommissioning and restoration |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 437 | 293 | 233
Current portion | 40 | 27 |
Non-current portion | 397 | 266 |
Other |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 33 | 50 | CAD 165
Current portion | 27 | 12 |
Non-current portion | CAD 6 | CAD 38 |

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