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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Changes in Level 3 (Details) - CAD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2023 | Jun. 30, 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 | 11 | 14
Included in OCI | 35 | (11)
Settlements | 3 | (2)
Level 3 net derivative liability at end of period | $ (87) | $ (107)

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