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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Restricted Long-Term Investments (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Long-Lived Assets Held-for-sale [Line Items]    
Assets Held-in-trust, Noncurrent $ 717 $ 593
Restricted long-term investments (Note 23) 717 593
Debt securities, available-for-sale, amortized cost 486 437
Unrealized holding gains (losses) $ 51 $ (122)
Fair value recurring basis unobservable input reconciliation asset gain loss statement of other comprehensive income extensible list not disclosed flag investments investments
Future abandonment costs $ 745  
Level 1    
Long-Lived Assets Held-for-sale [Line Items]    
Restricted long-term investments (Note 23) 263 $ 236
Level 2    
Long-Lived Assets Held-for-sale [Line Items]    
Restricted long-term investments (Note 23) $ 454 $ 357