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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - Level 3 Inputs (Details) $ in Millions | Jun. 30, 2023 CAD ($) $ / MillionsofBTU-MMBTU $ / MWh $ / bbl | Dec. 31, 2022 CAD ($)
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Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | $ 5 | $ (546)
Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | 5 | (546)
Level 3 |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (87) |
Level 3 | Fair Value |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair Value | (87) | $ (136)
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 | $ (16) |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MillionsofBTU-MMBTU | 1.59 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MillionsofBTU-MMBTU | 8.82 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MillionsofBTU-MMBTU | 4.48 |
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 | $ (8) |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / bbl | 70.23 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / bbl | 90.70 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / bbl | 81.07 |
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 | $ (91) |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MWh | 25.85 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MWh | 255.75 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MWh | 63.34 |
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 | $ (12) |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MillionsofBTU-MMBTU | 1.66 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MillionsofBTU-MMBTU | 23.07 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / MillionsofBTU-MMBTU | 4.65 |
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 | $ (3) |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / bbl | 73.18 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / bbl | 116.60 |
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 ($ / mmbtu, barrel, gallon, MW/H) | $ / bbl | 86.60 |
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 | $ 43 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Power | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H) | $ / MWh | 24.26 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Power | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H) | $ / MWh | 96.39 |
Market approach valuation technique | Level 3 | Commodity contracts - physical | Power | Weighted Average |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price ($ / mmbtu, barrel, gallon, MW/H) | $ / MWh | 55.05 |

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