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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - LEVEL 3 INPUTS (Details) $ in Millions | Dec. 31, 2019 CAD ($) $ / bbl $ / MWh $ / MillionsofBTU-MMBTU $ / Gallon-gal | Dec. 31, 2018 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (1,687) | $ (3,210)
Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (1,687) | (3,210)
Level 3 | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (69) | $ (11)
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 1.95 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 4.88 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 3.04 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude oil | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 44.24 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude oil | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 82.29 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude oil | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 52.76 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 0.54 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 0.86 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 0.82 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 27.84 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 71.79 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 57.46 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 1.00 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 8.37 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 2.53 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 40.20 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 90.75 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 70.27 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 0.18 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 2.01 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / Gallon-gal | 0.79 |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Financial | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 0 |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Financial | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | 4 |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Financial | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | 3 |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Financial | Power |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (61) |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Physical | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | 28 |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Physical | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (45) |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Physical | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 2 |

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