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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS - LEVEL 3 DERIVATIVE INSTRUMENTS (Details) CAD in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2016 CAD CAD / bbl CAD / MMBTU CAD / gal CAD / MWh | Dec. 31, 2015 CAD
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD (4,879) | CAD (4,748)
Level 3 |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | (176) | CAD 54
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD 21 |
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 | CAD / MMBTU | 3.41 |
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 | CAD / MMBTU | 4.91 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Natural gas | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / MMBTU | 4.10 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD 10 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / gal | 0.31 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / gal | 1.34 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | NGL | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / gal | 0.94 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD (156) |
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 | CAD / MWh | 27.25 |
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 | CAD / MWh | 76.42 |
Market approach valuation technique | Level 3 | Commodity Contracts - Financial | Power | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / MWh | 53.36 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD (59) |
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 | CAD / MMBTU | 2.35 |
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 | CAD / MMBTU | 5.00 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Natural gas | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / MMBTU | 3.55 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD (39) |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / bbl | 44.26 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / bbl | 73.57 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | Crude oil | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / bbl | 61.33 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD 4 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / gal | 0.22 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / gal | 1.87 |
Market approach valuation technique | Level 3 | Commodity Contracts - Physical | NGL | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Forward price | CAD / gal | 0.87 |
Option model valuation technique | Level 3 | Commodity Options | Crude oil |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD 21 |
Option model valuation technique | Level 3 | Commodity Options | Crude oil | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 27.00% |
Option model valuation technique | Level 3 | Commodity Options | Crude oil | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 39.00% |
Option model valuation technique | Level 3 | Commodity Options | Crude oil | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 31.00% |
Option model valuation technique | Level 3 | Commodity Options | NGL |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD 21 |
Option model valuation technique | Level 3 | Commodity Options | NGL | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 7.00% |
Option model valuation technique | Level 3 | Commodity Options | NGL | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 91.00% |
Option model valuation technique | Level 3 | Commodity Options | NGL | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 38.00% |
Option model valuation technique | Level 3 | Commodity Options | Power |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Fair value | CAD 1 |
Option model valuation technique | Level 3 | Commodity Options | Power | Minimum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 24.00% |
Option model valuation technique | Level 3 | Commodity Options | Power | Maximum |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 42.00% |
Option model valuation technique | Level 3 | Commodity Options | Power | Weighted average price |  |
Significant unobservable inputs used in the fair value measurement of Level 3 derivative instruments |  |
Option Volatility (as a percent) | 25.00% |

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