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LONG TERM INVESTMENTS (Details) (CAD) In Millions, unless otherwise specified | 12 Months Ended |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  |  |  |  |
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 Preferred stock Minimum | Dec. 31, 2012 Preferred stock Maximum | Dec. 31, 2012 Other Corporate | Dec. 31, 2011 Other Corporate | Dec. 31, 2012 Joint Ventures | Dec. 31, 2011 Joint Ventures | Dec. 31, 2010 Joint Ventures | Dec. 31, 2012 Chicap Pipeline joint venture Liquids Pipelines | Dec. 31, 2011 Chicap Pipeline joint venture Liquids Pipelines | Dec. 31, 2012 Mustang Pipeline joint venture Liquids Pipelines | Dec. 31, 2011 Mustang Pipeline joint venture Liquids Pipelines | Dec. 31, 2012 Seaway Pipeline joint venture Liquids Pipelines | Dec. 31, 2011 Seaway Pipeline joint venture Liquids Pipelines | Dec. 31, 2012 Texas Express Pipeline joint venture Sponsored Investments | Dec. 31, 2011 Texas Express Pipeline joint venture Sponsored Investments | Dec. 31, 2012 Offshore - various joint ventures Gas Pipelines, Processing and Energy Services | Dec. 31, 2011 Offshore - various joint ventures Gas Pipelines, Processing and Energy Services | Dec. 31, 2012 Offshore - various joint ventures Gas Pipelines, Processing and Energy Services Minimum | Dec. 31, 2012 Offshore - various joint ventures Gas Pipelines, Processing and Energy Services Maximum | Dec. 31, 2012 Vector Pipeline joint venture Gas Pipelines, Processing and Energy Services | Dec. 31, 2011 Vector Pipeline joint venture Gas Pipelines, Processing and Energy Services | Dec. 31, 2012 Alliance Pipeline US joint venture Gas Pipelines, Processing and Energy Services | Dec. 31, 2011 Alliance Pipeline US joint venture Gas Pipelines, Processing and Energy Services | Dec. 31, 2012 Aux Sable joint venture Gas Pipelines, Processing and Energy Services | Dec. 31, 2011 Aux Sable joint venture Gas Pipelines, Processing and Energy Services | Dec. 31, 2012 Aux Sable joint venture Gas Pipelines, Processing and Energy Services Minimum | Dec. 31, 2012 Aux Sable joint venture Gas Pipelines, Processing and Energy Services Maximum | Jul. 31, 2011 Aux Sable joint venture Palermo Conditioning Plant and the Prairie Rose Pipeline | Dec. 31, 2012 Other joint ventures Gas Pipelines, Processing and Energy Services | Dec. 31, 2011 Other joint ventures Gas Pipelines, Processing and Energy Services | Dec. 31, 2012 Other joint ventures Gas Pipelines, Processing and Energy Services Minimum | Dec. 31, 2012 Other joint ventures Gas Pipelines, Processing and Energy Services Maximum | Dec. 31, 2012 Other joint ventures Sponsored Investments | Dec. 31, 2011 Other joint ventures Sponsored Investments | Dec. 31, 2012 Alliance Pipeline Canada joint venture Sponsored Investments | Dec. 31, 2011 Alliance Pipeline Canada joint venture Sponsored Investments | Dec. 31, 2012 Noverco Common stock | Dec. 31, 2011 Noverco Common stock | Dec. 31, 2010 Noverco Common stock | Dec. 31, 2012 Noverco Common stock Corporate | Dec. 31, 2012 Noverco Preferred stock | Dec. 31, 2012 Noverco Preferred stock Minimum | Dec. 31, 2012 Noverco Preferred stock Maximum | Dec. 31, 2012 Noverco Preferred stock Corporate | Dec. 31, 2011 Noverco Preferred stock Corporate | Dec. 31, 2012 Other Equity Investments Corporate | Dec. 31, 2011 Other Equity Investments Corporate | Dec. 31, 2012 Other Equity Investments Corporate Minimum | Dec. 31, 2012 Other Equity Investments Corporate Maximum
LONG TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership Interest (as a percent) |  |  |  |  |  |  |  |  |  | 43.80% |  | 30.00% |  | 50.00% |  | 35.00% |  |  |  | 22.00% | 74.30% | 60.00% |  | 50.00% |  |  |  | 42.70% | 50.00% |  |  |  | 33.30% | 70.00% | 50.00% |  | 50.00% |  | 38.90% | 38.90% | 32.10% | 38.90% |  |  |  |  |  |  |  | 8.90% | 41.00%
Equity Investments |  |  |  |  |  |  |  |  |  | 27 | 27 | 21 | 27 | 1,385 | 1,186 | 183 | 11 | 391 | 420 |  |  | 142 | 160 | 282 | 293 | 266 | 217 |  |  |  | 10 | 21 |  |  | 35 | 47 | 277 | 296 |  |  |  |  |  |  |  |  |  | 55 | 34 |  |
Other Long-Term Investments |  |  |  |  | 66 | 57 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 246 | 285 |  |  |  |
Long term investments | 3,386 | 3,081 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired in Palermo Conditioning Plant and the Prairie Rose Pipeline (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 42.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 636 | 651 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortizable assets | 493 | 450 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income statement of unconsolidated equity investments of joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | 921 | 804 | 771 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commodity costs |  |  |  |  |  |  | (236) | (138) | (92) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating and administrative expenses |  |  |  |  |  |  | (244) | (200) | (203) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  | (159) | (158) | (158) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other expense |  |  |  |  |  |  | 4 | (3) | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  |  | (81) | (87) | (96) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings before income taxes |  |  |  |  |  |  | 205 | 218 | 221 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance sheet of unconsolidated equity investments of joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | 299 | 231 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment, net |  |  |  |  |  |  | 3,192 | 2,864 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred amounts and other assets |  |  |  |  |  |  | 204 | 273 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | 74 | 87 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 639 | 651 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  | (333) | (230) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | (895) | (926) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  |  |  | (161) | (245) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets |  |  |  |  |  |  | 3,019 | 2,705 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative dividends per share calculation, maturity period of Government of Canada bond | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent) |  |  | 4.30% | 4.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.30% | 4.40% |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 8.90% | 9.00% |  |  |  |  |  |  |  |  |  |
Number of shares sold through secondary offering |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22.5 |  |  |  |  |  |  |  |  |  |  |  |
Amount of change in equity investment and shareholder's equity by the reciprocal shareholding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 297 |  |  |  |  |  |  |  |  |  |  |  |
Dividend received invested to increase common share investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 317 |  |  |  |  |  |  |  |  |  |  |  |
Indirect pro-rata interest of the entity in the shares of the entity (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.10% | 3.50% |  |  |  |  |  |  |  |  |  |  |
Amount reduced from equity investment and shareholder's equity by the reciprocal shareholding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 126 | 187 | 154 |  |  |  |  |  |  |  |  |  |

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- Definition The amount of the earnings before income taxes reported by an equity method investment of the entity. + References No definition available. + Details
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