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COMMITMENTS AND CONTINGENT LIABILITIES - Other (Details) - CAD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Jan. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of contingent liabilities [line items]      
Acquisition of property, plant and equipment   $ 263  
Acquisition of intangible assets 1   475  
Our share of commitments related to associates and joint ventures   306  
Total other commitments   1,044  
Purchase of intangible assets, classified as investing activities   $ 74 $ 47
Payment Of Intangible Assets Acquired      
Disclosure of contingent liabilities [line items]      
Purchase of intangible assets, classified as investing activities $ 95