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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - LEVEL 3 INPUTS (Details) $ in Millions | Dec. 31, 2021 CAD ($) $ / MillionsofBTU-MMBTU $ / bbl $ / MWh | Dec. 31, 2020 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (359) | $ (1,069)
Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value |  | (1,069)
Level 3 | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (108) | $ (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 | $ / MillionsofBTU-MMBTU | 3.12 |
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 | 9.05 |
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 | 4.49 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 76.02 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 98.99 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 91.73 |
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 | 31.00 |
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 | 125.13 |
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 | 76.23 |
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 | $ / MillionsofBTU-MMBTU | 2.65 |
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 | 9.25 |
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 | 4.63 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 68.66 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 97.00 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 87.97 |
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 | $ (19) |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Financial | Crude |  |
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 | (60) |
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 | (56) |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Physical | Crude |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 24 |

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