RELATED PARTY TRANSACTIONS - Key Management Personnel Compensation (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Related Party [Abstract]
Salaries and other short-term employee benefits	$ 13	$ 10
Post-employment benefits	2	3
Stock-based compensation	18	19
Total compensation	$ 33	$ 32

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

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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]]

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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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