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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Schedule of Significant Unobservable Inputs Used in the Fair Value Measurement of Level 3 Derivative Instruments (Details) $ in Millions | Jun. 30, 2025 CAD ($) $ / MMBTU $ / bbl $ / MWh | Dec. 31, 2024 CAD ($)
--- | --- | ---
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ (926) | $ (2,250)
Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | (926) | (2,250)
Level 3 |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | 17 |
Level 3 | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ 17 | $ (52)
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) | 3 |
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) | 74 |
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) | 52 |
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) | 2.31 |
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) | 8.99 |
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) | 5.22 |
Natural gas | Commodity Contracts - Financial | Level 3 | Fair Value | Market Approach Valuation Technique |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ 8 |
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) | 0.35 |
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) | 13.79 |
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) | 4.42 |
Natural gas | Commodity Contracts - Physical | Level 3 | Fair Value | Market Approach Valuation Technique |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ (45) |
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) | 3.62 |
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) | 11.03 |
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) | 7.22 |
Natural gas | Commodity Options | Level 3 | Fair Value | Market Approach Valuation Technique |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ 69 |
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 | 63.63 |
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 | 87.11 |
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 | 83.24 |
Crude | Commodity Contracts - Financial | Level 3 | Fair Value | Market Approach Valuation Technique |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ 5 |
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 | 65.05 |
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 | 112.22 |
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 | 85.79 |
Crude | Commodity Contracts - Physical | Level 3 | Fair Value | Market Approach Valuation Technique |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ (6) |
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 | 31.69 |
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 | 185.09 |
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 | 69.54 |
Power | Commodity Contracts - Financial | Level 3 | Fair Value | Market Approach Valuation Technique |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ (7) |
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 | 28.7 |
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 | 139.72 |
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 | 70.66 |
Power | Commodity Contracts - Physical | Level 3 | Fair Value | Market Approach Valuation Technique |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ | $ (7) |

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