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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Level 3 Inputs (Details) $ in Millions | Dec. 31, 2024 CAD ($) $ / MWh $ / MillionsofBTU-MMBTU $ / bbl | Dec. 31, 2023 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (2,250) | $ (404)
Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (2,250) | (404)
Level 3 |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (52) |
Level 3 | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (52) | $ (131)
Commodity Options | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | 0.03 |
Commodity Options | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | 0.77 |
Commodity Options | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | 0.50 |
Natural gas | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 3.73 |
Natural gas | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 9.85 |
Natural gas | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 4.12 |
Natural gas | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (5) |
Natural gas | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 1.40 |
Natural gas | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 22.57 |
Natural gas | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 4.12 |
Natural gas | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (80) |
Natural gas | Commodity Options | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 2.44 |
Natural gas | Commodity Options | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 7.09 |
Natural gas | Commodity Options | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MillionsofBTU-MMBTU | 4.44 |
Natural gas | Commodity Options | Level 3 | Market approach valuation technique | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 166 |
Crude | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / bbl | 73.54 |
Crude | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / bbl | 104.42 |
Crude | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / bbl | 97.44 |
Crude | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (13) |
Crude | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / bbl | 77.31 |
Crude | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / bbl | 118.28 |
Crude | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / bbl | 99.76 |
Crude | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 22 |
Power | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MWh | 31.17 |
Power | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MWh | 229.29 |
Power | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MWh | 68.51 |
Power | Commodity Contracts - Financial | Level 3 | Market approach valuation technique | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (44) |
Power | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MWh | 12.94 |
Power | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Maximum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MWh | 211.42 |
Power | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Price volatility (in $/MMBTU, $/barrel, $ / MW/H, percent) | $ / MWh | 70.30 |
Power | Commodity Contracts - Physical | Level 3 | Market approach valuation technique | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (98) |

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