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Share Capital - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 03, 2021
Mar. 04, 2020
Mar. 06, 2019
Feb. 28, 2018
Dec. 31, 2020
May 22, 2020
Dec. 31, 2019
Dec. 31, 2018
May 21, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Quarterly dividend declared (in CAD per share) $ 0.47 $ 0.425 $ 0.375 $ 0.335          
Share repurchase term           12 years      
Shares repurchased and retired (in shares)         6,970,000        
Weighted average price per share of shares repurchased and retired (in CAD per share)         $ 38.84        
Purchase of common shares under Normal Course Issuer Bid         $ 271        
Normal Course Issuer Bid, percent of issued and outstanding shares 5.00%                
Top of range                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Shares authorized to be repurchased through Normal Course Issuer Bid (in shares)                 59,729,706
Stock options                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Vesting term         5 years        
Shares that may be reserved for issuance as a percentage of common shares outstanding         7.00%        
Stock options | Bottom of range                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Expiration term         5 years        
Stock options | Top of range                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Expiration term         6 years        
Retained earnings                  
Disclosure of terms and conditions of share-based payment arrangement [line items]                  
Purchase of common shares under Normal Course Issuer Bid         $ 215   $ 738 $ 1,044