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Right of Use Assets - Narrative (Details) - CAD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items]        
Payments of lease liabilities, classified as financing activities   $ 15 $ 33  
Interest expense on lease liabilities   7 8 $ 4
Repayments of principal on lease liabilities   8 25  
Expense relating to variable lease payments not included in measurement of lease liabilities   $ 6 $ 7  
Pipeline        
Disclosure of quantitative information about right-of-use assets [line items]        
Decrease through derecognition, financial assets $ 41      
Decrease through derecognition, financial liabilities 43      
Gains (losses) on available-for-sale financial assets $ 2