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Equity Capital and Earnings Per Share - Summary of Further Information on Preferred Shares and Other Equity Instruments Outstanding (Detail) - CAD ($)
shares in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [Line Items]    
Face amount $ 440,077,000,000 $ 395,957,000,000
Other equity interest [member] | Series 1(LRCN-Series 1) [member]    
Disclosure of classes of share capital [Line Items]    
Issue date Feb. 19, 2021  
Annual dividend rate 3.375%  
Earliest redemption date May 19, 2026  
Face amount $ 2,000,000,000  
Net amount $ 1,982,000,000 1,982,000,000
Other equity interest [member] | Series 2 (LRCN-Series 2) [member]    
Disclosure of classes of share capital [Line Items]    
Issue date Nov. 12, 2021  
Annual dividend rate 4.10%  
Earliest redemption date Feb. 19, 2027  
Face amount $ 1,200,000,000  
Net amount $ 1,189,000,000 1,189,000,000
Other equity interest [member] | Series 3(LRCN-Series 1) [member]    
Disclosure of classes of share capital [Line Items]    
Issue date Jun. 16, 2022  
Annual dividend rate 7.117%  
Earliest redemption date Jun. 19, 2027  
Face amount $ 1,000,000,000  
Net amount $ 990,000,000 990,000,000
Class 1, Series 3 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Mar. 11, 2011  
Annual dividend rate 2.348%  
Earliest redemption date Jun. 19, 2026  
Number of shares 7  
Face amount $ 163,000,000  
Net amount $ 160,000,000 160,000,000
Class 1, Series 4 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Jun. 20, 2016  
Earliest redemption date Jun. 19, 2026  
Number of shares 1  
Face amount $ 37,000,000  
Net amount $ 36,000,000 36,000,000
Class 1, Series 9 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date May 24, 2012  
Annual dividend rate 5.978%  
Earliest redemption date Sep. 19, 2027  
Number of shares 10  
Face amount $ 250,000,000  
Net amount $ 244,000,000 244,000,000
Class 1, Series 11 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Dec. 04, 2012  
Annual dividend rate 6.159%  
Earliest redemption date Mar. 19, 2028  
Number of shares 8  
Face amount $ 200,000,000  
Net amount $ 196,000,000 196,000,000
Class 1, Series 13 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Jun. 21, 2013  
Annual dividend rate 6.35%  
Earliest redemption date Sep. 19, 2028  
Number of shares 8  
Face amount $ 200,000,000  
Net amount $ 196,000,000 196,000,000
Class 1, Series 15 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Feb. 25, 2014  
Annual dividend rate 3.786%  
Earliest redemption date Jun. 19, 2024  
Number of shares 8  
Face amount $ 200,000,000  
Net amount $ 195,000,000 195,000,000
Class 1, Series 17 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Aug. 15, 2014  
Annual dividend rate 3.80%  
Earliest redemption date Dec. 19, 2024  
Number of shares 14  
Face amount $ 350,000,000  
Net amount $ 343,000,000 343,000,000
Class 1, Series 19 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Dec. 03, 2014  
Annual dividend rate 3.675%  
Earliest redemption date Mar. 19, 2025  
Number of shares 10  
Face amount $ 250,000,000  
Net amount $ 246,000,000 246,000,000
Class 1, Series 25 Preferred Shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Feb. 20, 2018  
Annual dividend rate 5.942%  
Earliest redemption date Jun. 19, 2028  
Number of shares 10  
Face amount $ 250,000,000  
Net amount $ 245,000,000 245,000,000
Class A, Series 2 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Feb. 18, 2005  
Annual dividend rate 4.65%  
Number of shares 14  
Face amount $ 350,000,000  
Net amount $ 344,000,000 344,000,000
Class A, Series 3 Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Issue date Jan. 03, 2006  
Annual dividend rate 4.50%  
Number of shares 12  
Face amount $ 300,000,000  
Net amount $ 294,000,000 294,000,000
Preferred shares [Member]    
Disclosure of classes of share capital [Line Items]    
Number of shares 102  
Face amount $ 6,750,000,000  
Net amount $ 6,660,000,000 $ 6,660,000,000