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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Level 3 (Details) - CAD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Changes in net fair value of derivative assets and liabilities classified as Level 3    
Level 3 net derivative liability at beginning of period $ (108) $ (191)
Total gain/(loss)    
Included in earnings 14 (143)
Included in OCI (11) (12)
Settlements (2) 168
Level 3 net derivative liability at end of period $ (107) $ (178)