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Share Based Compensation - Expense (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Share Based Compensation |  |
Equity-settled plans | $ 17 | $ 21
Cash-settled plans | 484 | 301
Total share-based compensation expense | $ 501 | $ 322

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