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Share-Based Compensation (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
SHARE BASED COMPENSATION |  |
Equity-settled plans | $ 46 | $ 48
Cash-settled plans | 181 | 334
Total share-based compensation expense | $ 227 | $ 382

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