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Interests in Other Entities - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Joint Ventures And Associates [Line Items]    
Dividends received from investments accounted for using equity method, classified as investing activities $ 29 $ 45
Bottom of range    
Disclosure Of Joint Ventures And Associates [Line Items]    
Interest in joint ventures and associates 24.99%  
Top of range    
Disclosure Of Joint Ventures And Associates [Line Items]    
Interest in joint ventures and associates 50.00%  
Canadian real estate joint ventures    
Disclosure Of Joint Ventures And Associates [Line Items]    
Increase in equity method investments $ (1) 19
Joint operations    
Disclosure Of Joint Ventures And Associates [Line Items]    
Investment properties and other assets 1,802 1,503
Fair value of jointly controlled assets 1,892 1,595
Joint ventures where entity is venturer    
Disclosure Of Joint Ventures And Associates [Line Items]    
Rental payments 17 $ 17
Future rental payments to joint ventures and associates $ 197  
Rental lease term 12 years