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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Level 3 Inputs (Details) $ in Millions | Sep. 30, 2019 CAD ($) $ / bbl $ / MWh $ / MillionsofBTU-MMBTU $ / Gallon-gal | Dec. 31, 2018 CAD ($)
--- | --- | ---
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (2,835) | $ (3,210)
Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (2,835) | (3,210)
Level 3 | Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (64) | $ (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 ($/mmbtu,barrel,gallon,MW/H) | $ / MillionsofBTU-MMBTU | 2.15 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MillionsofBTU-MMBTU | 5.10 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MillionsofBTU-MMBTU | 3.15 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 36.94 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 64.65 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 48.61 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 0.16 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 0.85 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 0.42 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MWh | 27.62 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MWh | 78.91 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MWh | 56.23 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MillionsofBTU-MMBTU | 1.01 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MillionsofBTU-MMBTU | 6.81 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / MillionsofBTU-MMBTU | 1.50 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 45.27 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 92.65 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / bbl | 52.73 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / Gallon-gal | 0.53 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / Gallon-gal | 0.75 |
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 ($/mmbtu,barrel,gallon,MW/H) | $ / Gallon-gal | 0.71 |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Financial | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (22) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Financial | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | 30 |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Financial | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | 5 |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Financial | Power |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (82) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Physical | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (23) |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Physical | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | 27 |
Market approach valuation technique | Level 3 | Recurring basis | Commodity Contracts - Physical | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 1 |

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