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Share Capital - Narrative (Details) - CAD ($)
$ / shares in Units, $ in Millions
2 Months Ended 12 Months Ended
Mar. 01, 2023
Nov. 02, 2022
Aug. 31, 2022
Aug. 03, 2022
Mar. 02, 2022
Nov. 03, 2021
Mar. 03, 2021
Mar. 02, 2021
Feb. 28, 2023
Mar. 10, 2023
Dec. 31, 2022
Mar. 08, 2022
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Dividend increase percentage 6.00% 13.00%     28.00% 25.00% 11.00%          
Dividend declared (in CAD per share) $ 0.90 $ 0.85   $ 1.50 $ 0.75 $ 0.5875 $ 0.47 $ 0.425        
Dividends paid, ordinary shares (in CAD per share)     $ 1.50                  
Share repurchase term                   12 months    
Shares repurchased and retired (in shares)                 6,000,000   77,338,200  
Weighted average price per share of shares repurchased and retired (in CAD per share)                 $ 77.72   $ 72.03  
Purchase of common shares under Normal Course Issuer Bid                 $ 466   $ 5,571  
Normal course issuer bid, percent of issued and outstanding shares 10.00%                      
Stock options                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Vesting term (in years)                     5 years  
Shares that may be reserved for issuance as a percentage of common shares outstanding                     7.00%  
Retained earnings                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Purchase of common shares under Normal Course Issuer Bid                     $ 4,868  
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)                       101,574,207
Top of range | Stock options                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Expiration term                     6 years  
Bottom of range | Stock options                        
Disclosure of terms and conditions of share-based payment arrangement [line items]                        
Expiration term                     5 years