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Interests in Other Entities - Financial Information of Joint Ventures and Associates (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Interests In Other Entities [Abstract]    
Carrying amount of interests in joint ventures and associates $ 1,510 $ 1,500
Our share of:    
Net income (loss) 86 91
Other comprehensive income (loss) (9) 7
Total comprehensive income (loss) $ 77 $ 98