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Provisions - Decommissioning and Restoration (Details) CAD in Millions | 12 Months Ended
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Dec. 31, 2017 CAD | Dec. 31, 2016 CAD
Provision for decommissioning, restoration and rehabilitation costs [abstract] |  |
Percentage change in discount rate used to arrive at provision for decommissioning, restoration and rehabilitation costs | 1.0 | 1.0
1% Increase | CAD (1,218.0) | CAD (1,036.0)
1% Decrease | CAD 1,758.0 | CAD 1,506.0

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- References No definition available. + Details
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- Definition Represents the percentage change in discount rate used to arrive at the provision for decommissioning restoration and rehabilitation costs. + References No definition available. + Details
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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation following a 1 % decrease in the discount rate. + References No definition available. + Details
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- Definition The amount of provision for costs related to decommissioning, restoration and rehabilitation following a 1 % increase in the discount rate. + References No definition available. + Details
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