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CASH AND CASH EQUIVALENTS (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH AND CASH EQUIVALENTS      
Cash $ 1,523 $ 1,232  
Cash equivalents 362 728  
Cash and cash equivalents $ 1,885 $ 1,960 $ 2,221