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Derivatives (Cash Collateral) (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments [Abstract]    
Derivative, Collateral, Obligation to Return Cash $ 119 $ 91
Derivative, Collateral, Right to Reclaim Cash 99 52
Collateral Already Posted, Aggregate Fair Value $ 310 $ 475