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Financial Instrument Risk Management - Right of Offset and Collateral (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of offsetting of financial liabilities [abstract]    
Gross financial liabilities presented in the Consolidated Statements of Financial Position $ (4,119) $ (3,732)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities 785 694
Financial collateral pledged 2,939 2,730
Net financial liabilities (395) (308)
Derivative liabilities    
Disclosure of offsetting of financial liabilities [abstract]    
Gross financial liabilities presented in the Consolidated Statements of Financial Position (2,295) (1,756)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities 768 694
Financial collateral pledged 1,132 754
Net financial liabilities (395) (308)
Financial assets pledged as collateral 1,726 1,127
Repurchase agreements    
Disclosure of offsetting of financial liabilities [abstract]    
Gross financial liabilities presented in the Consolidated Statements of Financial Position (1,824) (1,976)
Financial instruments subject to enforceable master netting arrangement or similar agreement not set off against financial liabilities 17 0
Financial collateral pledged 1,807 1,976
Net financial liabilities 0 0
Financial assets pledged as collateral 1,824 1,976
Derivative assets    
Disclosure of offsetting of financial assets [line items]    
Gross financial assets presented in the Consolidated Statements of Financial Position 1,112 1,478
Financial instruments subject to master netting or similar agreements (768) (694)
Financial collateral received (298) (662)
Net financial assets 46 122
Disclosure of offsetting of financial liabilities [abstract]    
Financial assets received as collateral 470 853
Reverse repurchase agreements    
Disclosure of offsetting of financial assets [line items]    
Gross financial assets presented in the Consolidated Statements of Financial Position 17 0
Financial instruments subject to master netting or similar agreements (17) 0
Financial collateral received 0 0
Net financial assets 0 0
Disclosure of offsetting of financial liabilities [abstract]    
Financial assets received as collateral 17 0
Financial assets    
Disclosure of offsetting of financial assets [line items]    
Gross financial assets presented in the Consolidated Statements of Financial Position 1,129 1,478
Financial instruments subject to master netting or similar agreements (785) (694)
Financial collateral received (298) (662)
Net financial assets $ 46 $ 122