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Provisions - Decommissioning and Restoration (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 CAD ($)	Dec. 31, 2017 CAD ($)
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	$ (1,099)	$ (1,218)
1% Decrease	$ 1,521	$ 1,758

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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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