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CASH AND CASH EQUIVALENTS (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
CASH AND CASH EQUIVALENTS      
Cash $ 1,232 $ 1,285  
Cash equivalents 728 936  
Cash and cash equivalents $ 1,960 $ 2,221 $ 2,672