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Cash and Cash Equivalents (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and Cash Equivalents      
Cash $ 1,717 $ 1,782  
Cash equivalents 12 198  
Cash and Cash Equivalents $ 1,729 $ 1,980 $ 2,205