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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - CHANGES IN LEVEL 3 (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Changes in net fair value of derivative assets and liabilities classified as Level 3 |  |
Level 3 net derivative asset at beginning of period | $ (387) | $ (295)
Total gains/(loss) |  |
Included in earnings | 206 | (184)
Included in OCI | 2 | 4
Settlements | 168 | 88
Level 3 net derivative asset at end of period | (11) | (387)
Amount of transfer of fair value of assets between levels | 0 | 0
Amount of transfer of fair value of liabilities between levels | $ 0 | $ 0

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