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Share Capital - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 02, 2022
Nov. 03, 2021
Mar. 03, 2021
Mar. 04, 2020
Mar. 06, 2019
Feb. 28, 2018
Mar. 23, 2022
Mar. 10, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 09, 2021
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Dividend increase percentage 28.00% 25.00% 11.00% 13.00% 12.00%              
Quarterly dividend declared (in CAD per share) $ 0.75 $ 0.5875 $ 0.47 $ 0.425 $ 0.375 $ 0.335            
Share repurchase term               12 years        
Shares repurchased and retired (in shares)             10,500,000   33,644,400      
Weighted average price per share of shares repurchased and retired (in CAD per share)             $ 64.79   $ 46.98      
Purchase of common shares under Normal Course Issuer Bid             $ 680   $ 1,581      
Normal course issuer bid, percent of issued and outstanding shares 10.00%                      
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)                       59,278,474
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                 $ 1,297 $ 215 $ 738