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Interests in Other Entities - Financial Information of Joint Ventures and Associates (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Interests In Other Entities [Abstract]    
Carrying amount of interests in joint ventures and associates $ 1,579 $ 1,510
Our share of:    
Net income (loss) 51 86
Other comprehensive income (loss) (9) (9)
Total comprehensive income (loss) $ 42 $ 77