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Risk Management - Schedule of Distribution of Debt Securities and Private Placements Portfolio by Sector and Industry (Detail) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 257,755 $ 250,961
% of total 100.00% 100.00%
Government and agency [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 84,739 $ 77,236
% of total 33.00% 31.00%
Utilities [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 45,952 $ 46,315
% of total 18.00% 18.00%
Financial [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 39,069 $ 38,808
% of total 15.00% 15.00%
Consumer [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 31,181 $ 31,556
% of total 12.00% 13.00%
Energy [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 15,782 $ 16,314
% of total 6.00% 7.00%
Industrial [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 24,209 $ 23,823
% of total 9.00% 9.00%
Other [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 16,823 $ 16,909
% of total 7.00% 7.00%