RELATED PARTY TRANSACTIONS - Key Management Personnel Compensation (Details) - CAD CAD in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Related Party [Abstract]
Salaries and other short-term employee benefits	CAD 10	CAD 12
Post-employment benefits	3	5
Stock-based compensation	19	30
Total compensation	CAD 32	CAD 47

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

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- Definition

The amount of compensation to key management personnel in the form of post-employment benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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The amount of compensation to key management personnel in the form of share-based payments. [Refer: Key management personnel of entity or parent [member]]

+ References

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- Definition

The amount of compensation to key management personnel in the form of short-term employee benefits. [Refer: Key management personnel of entity or parent [member]]

+ References

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Related Party [Abstract]

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No definition available.

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