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Equity - Additional Information (Detail)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2023
$ / shares
Feb. 18, 2023
$ / shares
shares
Oct. 31, 2022
shares
Dec. 31, 2022
CAD ($)
$ / shares
Sep. 30, 2022
$ / shares
Jun. 30, 2022
$ / shares
Mar. 31, 2022
CAD ($)
$ / shares
Dec. 31, 2021
CAD ($)
$ / shares
Sep. 30, 2021
$ / shares
Jun. 30, 2021
$ / shares
Mar. 31, 2021
$ / shares
Dec. 31, 2022
CAD ($)
shares
votePerShare
$ / shares
Dec. 31, 2021
CAD ($)
shares
$ / shares
Dec. 31, 2017
consecutive_trading_days
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Share option, available for grant (in shares) | shares                       10,693,150    
Share option, granted (in shares) | shares                       1,729,260 2,519,000  
Weighted average exercise price of share options granted in share-based payment arrangement | $ / shares                       $ 45.51 $ 29.04  
Weighted average exercise price | $ / shares                       $ 17.13 10.83  
Share option granted, vesting period                       3 years    
Share option granted, term                       10 years    
Average share price (in usd per share) | $ / shares                       $ 45.75 $ 29.25  
Share based compensation expense (recovery)                       $ 236 $ 125  
Dilutive shares were not included in the diluted earnings per share | shares                       1,635,225,000 7,700,774,000  
Dividends paid, ordinary shares per share | $ / shares               $ 0.05 $ 0.05 $ 0.05 $ 0.05      
Dividends declared and paid per share                       $ 532 $ 106  
Payments to acquire or redeem entity's shares                       1,392 0  
Potential ordinary share transactions                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Sunset period   6 years                        
Share Options                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Share based compensation expense (recovery)                       26 28  
PSUs                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Consecutive trading days | consecutive_trading_days                           20
Share options granted percentage                           50.00%
PSUs | Bottom of range                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Vesting percentage                           0.00%
PSUs | Top of range                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Vesting percentage                           200.00%
Deferred share units (DSUs), restricted share units (RSUs), performance share units (PSUs) and performance deferred share units (PDSUs)                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Share based compensation expense (recovery)                       210 97  
Total liability and intrinsic value for vested Units       $ 230       $ 160       $ 230 $ 160  
Class A Common Shares                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Number of votes per share | votePerShare                       100    
Dividends paid, ordinary shares per share | $ / shares       $ 0.125 $ 0.125 $ 0.125 $ 0.625              
Dividends declared and paid per share             $ 337              
Class A Common Shares | Potential ordinary share transactions                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Shares converted (in shares) | shares   1                        
Dividends paid, ordinary shares per share | $ / shares $ 0.50 $ 0.625                        
Class B Subordinate Voting Shares                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Number of votes per share | votePerShare                       1    
Number of share options issuable for grants (in shares) | shares                       46,000,000    
Dividends paid, ordinary shares per share | $ / shares       $ 0.125 $ 0.125 $ 0.125 $ 0.625              
Dividends declared and paid per share             $ 337              
Stock repurchase program, term                       1 year    
Purchase of voting shares under normal course issuer bid (in shares) | shares                       30,703,473 0  
Payments to acquire or redeem entity's shares                       $ 1,400    
Treasury Stock Shares Authorized For Repurchase | shares     40,000,000                      
Class B Subordinate Voting Shares | Potential ordinary share transactions                            
Disclosure of terms and conditions of share-based payment arrangement [line items]                            
Shares converted (in shares) | shares   0.67                        
Dividends paid, ordinary shares per share | $ / shares $ 0.50 $ 0.625