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Equity Capital and Earnings Per Share - Summary of Further Information on Preferred Shares and Other Equity Instruments Outstanding (Parenthetical) (Detail)
 12 Months Ended
Nov. 12, 2021
CAD ($)
Jun. 19, 2021
shares
Feb. 19, 2021
CAD ($)
Dec. 31, 2021
CAD ($)
shares
Dec. 31, 2021
$ / shares
Dec. 31, 2020
CAD ($)
Disclosure of classes of share capital [Line Items]            
Principal amount | $       $ 440,098,000,000   $ 418,978,000,000
Other equity interest [member] | Series 1(LRCN-Series 1) [member]            
Disclosure of classes of share capital [Line Items]            
Earliest redemption date       May 19, 2026    
Principal amount | $     $ 2,000,000,000 $ 2,000,000,000    
Maturity     June 19, 2081      
Other equity interest [member] | Series 1(LRCN-Series 1) [member] | Before JuneEighteen Two Thousand and Twenty Six [Member]            
Disclosure of classes of share capital [Line Items]            
Interest rate     3.375%      
Other equity interest [member] | Series 1(LRCN-Series 1) [member] | On JuneEighteen Two Thousand and Twenty Six and every Five Years Thereafter Until JuneNighteen Two Thousand and Seventy Six [Member]            
Disclosure of classes of share capital [Line Items]            
Floating dividend rate, description     interest rate equal to the five-year Government of Canada yield as defined in the prospectus, plus 2.839%.      
Interest rate, basis     2.839      
Other equity interest [member] | Series 2 (LRCN-Series 2) [member]            
Disclosure of classes of share capital [Line Items]            
Earliest redemption date       Feb. 19, 2027    
Principal amount | $ $ 1,200,000,000     $ 1,200,000,000    
Maturity March 19, 2082          
Other equity interest [member] | Series 2 (LRCN-Series 2) [member] | Before May Eighteen Two Thousand And Twenty Seven [Member]            
Disclosure of classes of share capital [Line Items]            
Interest rate 4.10%          
Other equity interest [member] | Series 2 (LRCN-Series 2) [member] | On May Eighteen Two Thousand And Twenty Seven And Every Five Years Thereafter Until March Nineteen Two Thousand and Seventy Seventy [Member]            
Disclosure of classes of share capital [Line Items]            
Floating dividend rate, description interest rate equal to the five-year Government of Canada yield as defined in the prospectus, plus 2.704%.          
Interest rate, basis 2.704          
Class 1, Series 4 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Number of shares   1,462,097   1,000,000    
Earliest redemption date       Jun. 19, 2026    
Principal amount | $       $ 37,000,000    
Class 1, Series 4 Preferred shares [Member] | Conversion of Class 1 Shares Series 4 Into Class 1 Shares Series 3 [member]            
Disclosure of classes of share capital [Line Items]            
Conversion of stock shares converted   1,014,452        
Number of shares   1,664,169        
Preferred stock conversion basis   one-for-one basis        
Class 1, Series 4 Preferred shares [Member] | If redeemed on June 19, 2021 [Member]            
Disclosure of classes of share capital [Line Items]            
Price per share | $ / shares         $ 25.00  
Class 1, Series 4 Preferred shares [Member] | If redeemed after June 19, 2021 [Member]            
Disclosure of classes of share capital [Line Items]            
Price per share | $ / shares         $ 25.50  
Class 1, Series 4 Preferred shares [Member] | Major ordinary share transactions [Member]            
Disclosure of classes of share capital [Line Items]            
Basis spread on dividend rate       1.41%    
Floating dividend rate, description       three-month Government of Canada Treasury bill yield plus 1.41%.    
Class 1, Series 3 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Annual dividend rate       2.348    
Specified yield percentage       1.41%    
Conversion of stock shares converted   6,537,903        
Number of shares       7,000,000    
Earliest redemption date       Jun. 19, 2026    
Principal amount | $       $ 163,000,000    
Class 1, Series 3 Preferred shares [Member] | Conversion of Class1 One Shares Series 3 Into Floating Rate Class 1Shares Series 4 [member]            
Disclosure of classes of share capital [Line Items]            
Conversion of stock shares converted   812,380        
Number of shares   6,335,831        
Preferred stock conversion basis   one-for-one basis        
Class 1, Series 5 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Number of shares       8,000,000    
Earliest redemption date       Dec. 19, 2021    
Principal amount | $       $ 200,000,000    
Class 1, Series 7 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       3.13%    
Number of shares       10,000,000    
Earliest redemption date       Mar. 19, 2022    
Principal amount | $       $ 250,000,000    
Class 1, Series 9 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       2.86%    
Number of shares       10,000,000    
Earliest redemption date       Sep. 19, 2022    
Principal amount | $       $ 250,000,000    
Class 1, Series 11 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       2.61%    
Number of shares       8,000,000    
Earliest redemption date       Mar. 19, 2023    
Principal amount | $       $ 200,000,000    
Class 1, Series 13 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       2.22%    
Number of shares       8,000,000    
Earliest redemption date       Sep. 19, 2023    
Principal amount | $       $ 200,000,000    
Class 1, Series 15 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       2.16%    
Number of shares       8,000,000    
Earliest redemption date       Jun. 19, 2024    
Principal amount | $       $ 200,000,000    
Class 1, Series 17 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       2.36%    
Number of shares       14,000,000    
Earliest redemption date       Dec. 19, 2024    
Principal amount | $       $ 350,000,000    
Class 1, Series 19 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       2.30%    
Number of shares       10,000,000    
Earliest redemption date       Mar. 19, 2025    
Principal amount | $       $ 250,000,000    
Class 1, Series 21 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Number of shares       17,000,000    
Earliest redemption date       Jun. 19, 2021    
Principal amount | $       $ 425,000,000    
Class 1, Series 23 Preferred shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       3.83%    
Number of shares       19,000,000    
Earliest redemption date       Mar. 19, 2022    
Principal amount | $       $ 475,000,000    
Class 1, Series 25 Preferred Shares [Member]            
Disclosure of classes of share capital [Line Items]            
Specified yield percentage       2.55%    
Number of shares       10,000,000    
Earliest redemption date       Jun. 19, 2023    
Principal amount | $       $ 250,000,000