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PROPERTY, PLANT AND EQUIPMENT - Narrative (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about property, plant and equipment [line items]    
Property, plant and equipment, weighted average capitalised interest rate 3.40% 3.70%
Adjustment to cost and accumulated depreciation $ 1,157 $ 978