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ACQUISITIONS AND DISPOSITIONS - Acquisitions (Narrative) (Details) - Moda Midstream Operating, LLC (Moda)
$ in Millions, $ in Millions
3 Months Ended 12 Months Ended
Oct. 12, 2021
USD ($)
Oct. 12, 2021
CAD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
CAD ($)
Oct. 12, 2021
CAD ($)
Business Acquisition [Line Items]          
Cash $ 3,000 $ 3,755      
Contingent consideration $ 150       $ 187
Ownership interest acquired (as a percent) 20.00%       20.00%
Amortized on a straight-line basis over an expected useful life 10 years 10 years      
Tax deductible period 15 years 15 years      
Acquisition-related expenses/transaction costs incurred       $ 21  
Revenues generated by acquiree     $ 80    
Earnings generated by acquiree     $ 9