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Derivatives (Cash Collateral) (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative Instruments [Abstract]    
Derivative, Collateral, Obligation to Return Cash $ 103 $ 119
Derivative, Collateral, Right to Reclaim Cash 77 99
Collateral Already Posted, Aggregate Fair Value $ 365 $ 310