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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, 2018
Dec. 31, 2017
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 221,348 $ 206,132
% 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 $ 73,858 $ 71,888
% of total 33.00% 35.00%
Utilities [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 41,929 $ 40,568
% of total 19.00% 20.00%
Financial [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 31,340 $ 27,923
% of total 14.00% 13.00%
Energy [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 17,685 $ 16,428
% of total 8.00% 8.00%
Industrial [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 17,508 $ 14,691
% of total 8.00% 7.00%
Consumer (non-cyclical) [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 16,483 $ 14,009
% of total 7.00% 7.00%
Consumer (cyclical) [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 7,707 $ 5,916
% of total 3.00% 3.00%
Securitized [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 3,300 $ 3,577
% of total 2.00% 2.00%
Telecommunications [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 3,716 $ 3,324
% of total 2.00% 2.00%
Basic materials [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 3,539 $ 3,248
% of total 2.00% 2.00%
Technology [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 2,352 $ 2,475
% of total 1.00% 1.00%
Media and internet [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 1,112 $ 1,136
% of total 1.00%  
Diversified and miscellaneous [Member]    
Disclosure of Distribution of Debt Securities and Private Placement Portfolio by Sector and Industry [line items]    
Carrying value $ 819 $ 949