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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Level 3 (Details) - CAD ($)
$ in Millions
9 Months Ended
Sep. 30, 2022
Sep. 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 41 (181)
Included in OCI (28) (29)
Settlements (2) 167
Level 3 net derivative liability at end of period $ (97) $ (234)