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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, 2022
Dec. 31, 2021
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 250,961 $ 266,981
% 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 $ 77,236 $ 84,244
% of total 31.00% 32.00%
Utilities [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 46,315 $ 48,372
% 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 $ 38,808 $ 38,905
% 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 $ 31,556 $ 32,671
% of total 13.00% 12.00%
Energy [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 16,314 $ 19,637
% of total 7.00% 7.00%
Industrial [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 23,823 $ 24,727
% 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 $ 16,909 $ 18,425
% of total 7.00% 7.00%