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EQUITY INVESTMENTS - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Feb. 01, 2023
Equity Investments          
Impairment of equity investment (Notes 7 and 11)   $ 3,048 $ 0 $ 0  
Difference between the carrying value of the investment and the underlying equity in the net assets $ 299 $ 299 $ 1,109    
Coastal GasLink | Canadian Natural Gas Pipelines | Subsequent event          
Equity Investments          
Expected cost of pipeline project         $ 14,500
Coastal GasLink | Canadian Natural Gas Pipelines          
Equity Investments          
Impairment of equity investment (Notes 7 and 11) 3,048        
Impairment charges after tax $ 2,643