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Financial Instrument Risk Management - Right of Offset and Collateral (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of offsetting of financial liabilities [abstract]    
Gross financial liabilities presented in the Consolidated Statements of Financial Position $ (3,890) $ (4,119)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities 740 785
Financial collateral pledged 2,784 2,939
Net financial liabilities (366) (395)
Derivative liabilities    
Disclosure of offsetting of financial liabilities [abstract]    
Gross financial liabilities presented in the Consolidated Statements of Financial Position (2,040) (2,295)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities 737 768
Financial collateral pledged 937 1,132
Net financial liabilities (366) (395)
Financial assets pledged as collateral 1,706 1,726
Repurchase agreements    
Disclosure of offsetting of financial liabilities [abstract]    
Gross financial liabilities presented in the Consolidated Statements of Financial Position (1,850) (1,824)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities 3 17
Financial collateral pledged 1,847 1,807
Net financial liabilities 0 0
Financial assets pledged as collateral 1,850 1,824
Derivative assets    
Disclosure of offsetting of financial assets [line items]    
Gross financial assets presented in the Consolidated Statements of Financial Position 1,548 1,112
Financial instruments subject to master netting or similar agreements (737) (768)
Financial collateral received (730) (298)
Net financial assets 81 46
Disclosure of offsetting of financial liabilities [abstract]    
Financial assets received as collateral 939 470
Reverse repurchase agreements    
Disclosure of offsetting of financial assets [line items]    
Gross financial assets presented in the Consolidated Statements of Financial Position 3 17
Financial instruments subject to master netting or similar agreements (3) (17)
Financial collateral received 0 0
Net financial assets 0 0
Disclosure of offsetting of financial liabilities [abstract]    
Financial assets received as collateral 3 17
Financial assets:    
Disclosure of offsetting of financial assets [line items]    
Gross financial assets presented in the Consolidated Statements of Financial Position 1,551 1,129
Financial instruments subject to master netting or similar agreements (740) (785)
Financial collateral received (730) (298)
Net financial assets $ 81 $ 46