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RELATED PARTY TRANSACTIONS (Details) (CAD) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
RELATED PARTY TRANSACTIONS |  |  |
Service charges | 127 | 106 | 102
Amounts receivable from affiliates | 182 | 194 |
Vector Pipeline joint venture |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Service charges | 6 | 6 | 7
Amounts receivable from affiliates | 178 | 190 |
Vector Pipeline joint venture | Minimum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Annual interest rate on the loans (as a percent) | 5.00% |  |
Vector Pipeline joint venture | Maximum |  |  |
RELATED PARTY TRANSACTIONS |  |  |
Annual interest rate on the loans (as a percent) | 8.00% |  |

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