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Cash And Cash Equivalents (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents      
Cash $ 1,285 $ 1,184  
Cash equivalents 936 1,488  
Cash and cash equivalents $ 2,221 $ 2,672 $ 3,016