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LONG-TERM INVESTMENTS - Disposition (Details)
$ in Millions, $ in Millions
 12 Months Ended
Aug. 17, 2022
CAD ($)
Aug. 17, 2022
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Apr. 01, 2024
CAD ($)
Mar. 31, 2024
Schedule of Equity Method Investments [Line Items]              
Gain on sale $ 1,100 $ 832 $ 0 $ 0 $ 1,076    
Goodwill     36,600 31,848 32,440    
Gas Transmission              
Schedule of Equity Method Investments [Line Items]              
Goodwill     18,278 $ 17,727 $ 18,106    
Disposal Group, Alliance Pipeline And Aux Sable              
Schedule of Equity Method Investments [Line Items]              
Gain on sale     $ 1,100        
Disposal Group, Alliance Pipeline And Aux Sable | Gas Transmission              
Schedule of Equity Method Investments [Line Items]              
Goodwill           $ 1,000  
Disposal Group, Alliance Pipeline And Aux Sable | Pembina Pipeline Corporation              
Schedule of Equity Method Investments [Line Items]              
Disposal group, consideration           3,100  
Non-recourse debt           $ 327  
Alliance Pipeline | Disposal Group, Alliance Pipeline And Aux Sable              
Schedule of Equity Method Investments [Line Items]              
Ownership interest (as percent)             50.00%