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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	Sep. 30, 2025 CAD ($) $ / bbl $ / MMBTU $ / MWh	Dec. 31, 2024 CAD ($)
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments
Fair Value	$ (1,204)	$ (2,250)
Fair Value
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments
Fair Value	(1,204)	(2,250)
Level 3
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments
Fair Value	190
Level 3 | Fair Value
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments
Fair Value	$ 190	$ (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)	79
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) | $ / MMBTU	1.3
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) | $ / MMBTU	19.49
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) | $ / MMBTU	5.1
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	$ 7
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) | $ / MMBTU	0.08
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) | $ / MMBTU	13.54
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) | $ / MMBTU	4.57
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	$ (11)
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) | $ / MMBTU	3.12
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) | $ / MMBTU	11.41
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) | $ / MMBTU	6.95
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	$ 198
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	65.36
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	87.86
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	82.84
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	$ 20
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	66.6
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	114.43
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	84.8
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	$ (10)
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	37.64
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	179.56
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	69.88
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	27.4
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	131.49
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	72.14
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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Value of input used to measure net derivative asset (liability).

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