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Inventory Change in Inventory (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of inventories [Abstract] |  |
Inventories at the beginning of the period | $ 219 | $ 213
Net addition |  | 11
Change in foreign exchange rates | 3 | (5)
Net addition | 20 |
Inventories at the end of the period | $ 242 | $ 219

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