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Provisions and Other Liabilities - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of other provisions [line items] |  |
Additional study and environmental costs arising from legal obligations through other provisions | $ 33 | $ 121
Provisions for decommissioning and restoration | 1,160 |
Provision for water management costs | 454 |
Provisions for decommissioning and restoration expenditures of closed operations | $ 249 | $ 270
Decommissioning and Restoration Provisions [member] |  |
Disclosure of other provisions [line items] |  |
Inflation rate | 2.00% |
Bottom of range [member] | Decommissioning and Restoration Provisions [member] |  |
Disclosure of other provisions [line items] |  |
Nominal discount rate | 6.49% |
Top of range [member] | Decommissioning and Restoration Provisions [member] |  |
Disclosure of other provisions [line items] |  |
Nominal discount rate | 7.99% |

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