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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Level 3 (Details) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Changes in net fair value of derivative assets and liabilities classified as Level 3    
Level 3 net derivative liability at beginning of period $ (136) $ (108)
Total gain/(loss)    
Included in earnings (44) (52)
Included in OCI 33 4
Settlements (1) (24)
Level 3 net derivative liability at end of period $ (148) $ (180)