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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, 2021
Dec. 31, 2020
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 266,981 $ 259,482
% 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 $ 84,244 $ 85,357
% of total 32.00% 33.00%
Utilities [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 48,372 $ 47,902
% 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 $ 38,905 $ 35,656
% 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 $ 32,671 $ 29,684
% of total 12.00% 11.00%
Energy [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 19,637 $ 20,963
% of total 7.00% 8.00%
Industrial [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 24,727 $ 22,070
% 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 $ 18,425 $ 17,850
% of total 7.00% 6.00%