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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Level 3 Inputs (Details) $ in Millions | Mar. 31, 2021 CAD ($) $ / MillionsofBTU-MMBTU $ / bbl $ / Gallon-gal $ / MWh | Dec. 31, 2020 CAD ($)
--- | --- | ---
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (266) | $ (1,069)
Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (266) | (1,069)
Level 3 | Recurring basis |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (119) | $ (191)
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 | 2.70 |
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 | 4.11 |
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 | 3.21 |
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 | 51.88 |
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 | 74.36 |
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 | 62.08 |
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 | 19.15 |
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 | 76.00 |
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 | 60.25 |
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 | 2.06 |
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 | 5.43 |
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 | 3.10 |
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 | 53.92 |
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 | 76.25 |
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 | 55.05 |
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 | 0.50 |
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 | 1.21 |
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 | 0.80 |
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 | $ (6) |
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 | 2 |
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 | (47) |
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 | 11 |
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 | (81) |
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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