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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Level 3 Inputs (Details) $ in Millions | Sep. 30, 2024 CAD ($) $ / MWh $ / bbl $ / MillionsofBTU-MMBTU | Dec. 31, 2023 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (1,161) | $ (404)
Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (1,161) | (404)
Level 3 |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (109) |
Level 3 | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (109) | $ (131)
Market approach valuation technique | Level 3 | Commodity contracts - financial | Natural gas | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (5) |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Natural gas | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MillionsofBTU-MMBTU | 2.65 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Natural gas | Maximum Price/ Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MillionsofBTU-MMBTU | 8.64 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Natural gas | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MillionsofBTU-MMBTU | 4.47 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Crude | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (10) |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Crude | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / bbl | 68.33 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Crude | Maximum Price/ Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / bbl | 93.84 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Crude | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / bbl | 89.52 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Power | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (75) |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Power | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MWh | 28.63 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Power | Maximum Price/ Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MWh | 162.60 |
Market approach valuation technique | Level 3 | Commodity contracts - financial | Power | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MWh | 60.57 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Natural gas | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (10) |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Natural gas | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MillionsofBTU-MMBTU | 0.05 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Natural gas | Maximum Price/ Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MillionsofBTU-MMBTU | 10.03 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Natural gas | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MillionsofBTU-MMBTU | 3.66 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Crude | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 25 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Crude | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / bbl | 70.48 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Crude | Maximum Price/ Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / bbl | 111.10 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Crude | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / bbl | 90.27 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Power | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ (73) |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Power | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MWh | 22.77 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Power | Maximum Price/ Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MWh | 144.39 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Power | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | $ / MWh | 61.52 |
Market approach valuation technique | Level 3 | Commodity Options | Natural gas | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 39 |
Market approach valuation technique | Level 3 | Commodity Options | Natural gas | Minimum Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | 0.06 |
Market approach valuation technique | Level 3 | Commodity Options | Natural gas | Maximum Price/ Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | 0.70 |
Market approach valuation technique | Level 3 | Commodity Options | Natural gas | Weighted Average Price/Volatility |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H, percent) | 0.46 |

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