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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Level 3 Inputs (Details) $ in Millions | Dec. 31, 2023 CAD ($) $ / MWh $ / bbl $ / MillionsofBTU-MMBTU | Dec. 31, 2022 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (404) | $ (546)
Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (404) | (546)
Level 3 |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (131) |
Level 3 | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (131) | $ (136)
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Minimum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 2.66 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Maximum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 8.29 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Weighted Average Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 3.78 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude | Minimum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 69.01 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude | Maximum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 92.76 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Crude | Weighted Average Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 80.35 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Minimum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 29.75 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Maximum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 145.24 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Weighted Average Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 59.21 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Minimum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 0.86 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Maximum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 11.85 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Weighted Average Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MillionsofBTU-MMBTU | 3.42 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude | Minimum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 64.51 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude | Maximum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 98.11 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude | Weighted Average Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / bbl | 82.85 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Power | Minimum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 18.20 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Power | Maximum Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 164.84 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Power | Weighted Average Price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | $ / MWh | 58.46 |
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 | $ (6) |
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 | (7) |
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 | (87) |
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 | 14 |
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 | (7) |
Market approach valuation technique | Level 3 | Fair Value | Commodity Contracts - Physical | Power |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (38) |

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