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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Level 3 (Details) - CAD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Changes in net fair value of derivative assets and liabilities classified as Level 3    
Level 3 net derivative liability at beginning of period $ (11) $ (387)
Total gain/(loss)    
Included in earnings 67 (146)
Included in OCI (22) 0
Settlements (98) 163
Level 3 net derivative liability at end of period $ (64) $ (370)