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Decommissioning and Other Provisions - Current and Non-Current Portion of Decommissioning and Other Provisions (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Disclosure of other provisions [line items] |  |  |
Balance | $ 456 | $ 470 | $ 343
Current portion | 70 | 67 |
Non-current portion | 386 | 403 |
Decommissioning and restoration |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 407 | 437 | 293
Current portion | 35 | 40 |
Non-current portion | 372 | 397 |
Other |  |  |
Disclosure of other provisions [line items] |  |  |
Balance | 49 | 33 | $ 50
Current portion | 35 | 27 |
Non-current portion | $ 14 | $ 6 |

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