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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Level 3 Inputs (Details) $ in Millions | Sep. 30, 2020 CAD ($) $ / MillionsofBTU-MMBTU $ / Gallon-gal $ / MWh $ / bbl | Dec. 31, 2019 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (2,020) | $ (1,687)
Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (2,020) | (1,687)
Level 3 | Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (64) | $ (69)
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 | 2.00 |
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 | 5.51 |
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 | 3.53 |
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 | 24.11 |
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 | 54.70 |
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 | 39.72 |
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 | 21.76 |
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 | 65.93 |
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 | 53.79 |
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 | 1.04 |
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 | 6.77 |
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 | 3.52 |
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 | 35.01 |
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 | 57.60 |
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 | 42.50 |
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 | 0.26 |
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 | 1.32 |
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 | 0.61 |
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 | $ (5) |
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 | 13 |
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 | (49) |
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 | 4 |
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 | (29) |
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 | $ 2 |

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