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v3.8.0.1

Other Liabilities and Provisions - Additional Information (Detail) - CAD CAD in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of other provisions [line items] |  |  |
Additional study and environmental costs arising from legal obligations through other provisions |  | CAD 121 |
Provisions for decommissioning and restoration | CAD 1,169 | 1,169 |
Provision for water management costs | 675 | 675 |
Provisions for decommissioning and restoration expenditures of closed operations | 270 | 270 | CAD 194
Provisions for decommissioning and restoration | 398 |  |
Increase in discount rate | CAD 36 | CAD 210 |
Decommissioning and Restoration Provisions [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Inflation rate |  | 2.00% |
Increase in discount rate |  | CAD 210 |
Bottom of range [member] | Decommissioning and Restoration Provisions [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Nominal discount rate |  | 5.32% |
Top of range [member] | Decommissioning and Restoration Provisions [member] |  |  |
Disclosure of other provisions [line items] |  |  |
Nominal discount rate |  | 6.82% |

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