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Goodwill (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill [Abstract]  
Schedule of Goodwill [Table Text Block]
21. GOODWILL
The change in goodwill for the year ended December 31 is due to the following:
millions of Canadian dollars 20182017
Balance, January 1$ 5,805$ 6,213
Change in foreign exchange rate 508 (408)
Balance, December 31$ 6,313$ 5,805