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ACQUISITIONS AND DISPOSITIONS - Disposition Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Apr. 01, 2024
Mar. 31, 2024
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on sale $ 0 $ 0 $ 1,091 $ 0    
Alliance Pipeline And Aux Sable            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Gain on sale     1,100      
Gas Transmission | Alliance Pipeline And Aux Sable            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Goodwill allocated to disposal group     $ 1,000      
Pembina Pipeline Corporation | Alliance Pipeline And Aux Sable            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Total consideration         $ 3,100  
Non-recourse debt         $ 327  
Alliance Pipeline Canada And Us | Alliance Pipeline And Aux Sable            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership interest (in percent)           50.00%
Aux Sable Midstream LLC and Aux Sable Liquid Products LP | Alliance Pipeline And Aux Sable            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership interest (in percent)           42.70%
Aux Sable Canada LP | Alliance Pipeline And Aux Sable            
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]            
Ownership interest (in percent)           50.00%