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COMMITMENTS AND CONTINGENCIES (Details) In Millions, unless otherwise specified | 8 Months Ended | 12 Months Ended |  |  | 0 Months Ended |  | 12 Months Ended | 0 Months Ended | 3 Months Ended | 12 Months Ended |  | 0 Months Ended |
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 CAD | Dec. 31, 2011 CAD | Dec. 31, 2010 CAD | Dec. 31, 2012 EEP USD ($) item | Dec. 31, 2012 EEP CAD | Dec. 31, 2011 EEP USD ($) | Dec. 31, 2011 EEP CAD | Dec. 31, 2012 Environmental Liabilities CAD | Dec. 31, 2011 Environmental Liabilities CAD | Aug. 07, 2012 Lakehead System Line 14 Crude Oil Release EEP | Jul. 27, 2012 Lakehead System Line 14 Crude Oil Release EEP bbl | Dec. 31, 2012 Lakehead System Line 14 Crude Oil Release EEP USD ($) | Dec. 31, 2012 Lakehead System Line 14 Crude Oil Release EEP CAD | Dec. 31, 2012 Line 6B Crude Oil Release USD ($) | Dec. 31, 2012 Line 6B Crude Oil Release CAD | Apr. 30, 2011 Line 6B Crude Oil Release EEP USD ($) | Jul. 26, 2010 Line 6B Crude Oil Release EEP mi bbl | Jul. 26, 2010 Line 6B Crude Oil Release EEP km | Sep. 30, 2012 Line 6B Crude Oil Release EEP USD ($) | Dec. 31, 2012 Line 6B Crude Oil Release EEP USD ($) item | Dec. 31, 2012 Line 6A Crude Oil Release CAD | Sep. 09, 2010 Line 6A Crude Oil Release EEP bbl | Dec. 31, 2012 Line 6A Crude Oil Release EEP USD ($) item
Amount expected to be paid within the next five years for contracts for the purchase of services, pipe and other materials, as well as transportation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total amount expected to be paid for contracts for the purchase of services, pipe and other materials, as well as transportation |  | 4,668 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  | 1,023 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum future payments under operating leases |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregated minimum future payments under operating leases |  | 329 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated annual lease payments for 2013 |  | 40 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated annual lease payments for 2014 |  | 41 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated annual lease payments for 2015 |  | 39 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated annual lease payments for 2016 |  | 38 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated annual lease payments for 2017 |  | 34 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Thereafter |  | 137 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rental expense for operating leases |  | 31 | 28 | 23 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 21.80% | 21.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental liabilities included in current liabilities |  | 107 | 175 |  |  |  |  |  | 107 | 175 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Environmental liabilities included in other long term liabilities |  |  |  |  |  |  |  |  | 18 | 32 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated volume of oil released (in barrels) |  |  |  |  |  |  |  |  |  |  |  | 1,700 |  |  |  |  |  | 20,000 | 20,000 |  |  |  | 9,000 |
Percentage of pressure prior to the incident up to which operating pressure was restricted by PHMSA |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Area affected by released crude oil |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38 | 61 |  |  |  |  |
Estimated volume of oil removed from the pipeline as part of the repair (in barrels) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400 |
Estimated cost |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  | 820 |  |  | 48
Estimated cost, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  | 137 |  |  |  |  |  | 7 |  |
Lost revenue |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |
Civil penalty |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.7 |  |  |  |
Increase in estimated cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55 |  |  |
Increase in estimated cost, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 |  |  |  |  |  |  |  |
Number of subsidiaries with which an insurance allocation agreement has been entered |  |  |  |  | 1 | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate limited amount for pollution liability under insurance program | 660 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 650 |  |  |  |  |  |  |
Amount of insurance claim recognized |  |  |  |  | 170 |  | 335 |  |  |  |  |  |  |  | 505 |  |  |  |  |  |  |  |  |
Amount of insurance claim recognized, net of tax |  |  |  |  |  | 24 |  | 50 |  |  |  |  |  |  |  | 74 |  |  |  |  |  |  |  |
Expected insurance recovery |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 145 |  |  |
Number of actions or claims filed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30 |  |  | 1

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