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RISK MANAGEMENT AND FINANCIAL INSTRUMENTS (Details 7) (CAD) In Millions, unless otherwise specified |  |  |  |  |  | 6 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2013 Level 3 | Dec. 31, 2012 Level 3 | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Natural gas | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Natural gas Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Natural gas Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Natural gas Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Crude oil | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Crude oil Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Crude oil Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Crude oil Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial NGL | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial NGL Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial NGL Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial NGL Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Power | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Power Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Power Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Financial Power Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Natural gas | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Natural gas Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Natural gas Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Natural gas Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Crude oil | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Crude oil Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Crude oil Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Crude oil Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical NGL | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical NGL Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical NGL Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical NGL Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Power | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Power Minimum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Power Maximum price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Contracts - Physical Power Weighted average price | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Options Natural gas | Jun. 30, 2013 Market approach valuation technique Level 3 Commodity Options NGL | Jun. 30, 2013 Option model valuation technique Level 3 Commodity Options Natural gas Minimum price | Jun. 30, 2013 Option model valuation technique Level 3 Commodity Options Natural gas Maximum price | Jun. 30, 2013 Option model valuation technique Level 3 Commodity Options Natural gas Weighted average price | Jun. 30, 2013 Option model valuation technique Level 3 Commodity Options NGL Minimum price | Jun. 30, 2013 Option model valuation technique Level 3 Commodity Options NGL Maximum price | Jun. 30, 2013 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value | (831) | (1,047) | (79) | (24) | 3 |  |  |  | 10 |  |  |  | 24 |  |  |  | (133) |  |  |  | (17) |  |  |  | 15 |  |  |  | 12 |  |  |  | (1) |  |  |  | 1 | 7 |  |  |  |  |  |
Forward price |  |  |  |  |  | 3.30 | 4.27 | 3.81 |  | 68.66 | 116.46 | 98.15 |  | 0.24 | 1.99 | 1.21 |  | 40.50 | 95.50 | 58.73 |  | 2.89 | 5.45 | 3.84 |  | 69.70 | 116.20 | 97.47 |  | 0.02 | 2.49 | 1.37 |  | 30.74 | 39.91 | 33.06 |  |  |  |  |  |  |  |
Option Volatility (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29.00% | 36.00% | 31.00% | 25.00% | 108.00% | 47.00%

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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 4, 17 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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