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Financial Instrument Risk Management - Maximum Exposure to Credit Risk (Details) - Credit risk - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 2,460 $ 1,752
Loans    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk 2,460 1,740
Guarantees    
Disclosure of credit risk exposure [line items]    
Maximum exposure to credit risk $ 0 $ 12