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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Level 3 (Details) - CAD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Changes in net fair value of derivative assets and liabilities classified as Level 3    
Level 3 net derivative liability at beginning of period $ (191) $ (69)
Total gain/(loss)    
Included in earnings (181) (40)
Included in OCI (29) 7
Settlements 167 38
Level 3 net derivative liability at end of period $ (234) $ (64)