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CONTINGENCIES (Details) In Millions, unless otherwise specified | 2 Months Ended | 3 Months Ended | 6 Months Ended |  | 0 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 USD ($) | Jun. 30, 2013 EEP USD ($) | Jun. 30, 2013 EEP CAD | Mar. 31, 2012 EEP USD ($) | Mar. 31, 2012 EEP CAD | Jun. 30, 2013 Line 6B Crude Oil Release USD ($) | Jun. 30, 2013 Line 6B Crude Oil Release CAD | Apr. 30, 2011 Line 6B Crude Oil Release EEP USD ($) | Jun. 30, 2013 Line 6B Crude Oil Release EEP USD ($) item | Mar. 31, 2013 Line 6B Crude Oil Release EEP USD ($) | Sep. 30, 2012 Line 6B Crude Oil Release EEP USD ($) | Jun. 30, 2013 Line 6B Crude Oil Release EEP USD ($) item | Jun. 30, 2013 Line 6A Crude Oil Release EEP item
COMMITMENTS AND CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  | 21.10% | 21.10% |  |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  |  | $ 1,035 |  |  | $ 1,035 |
Estimated cost, net of tax |  |  |  |  |  |  | 167 |  |  |  |  |  |
Increase in estimated cost |  |  |  |  |  |  |  |  | 40 | 175 |  | 215 |
Increase in estimated cost, net of tax |  |  |  |  |  |  | 30 |  |  |  |  |  |
Civil penalty |  |  |  |  |  |  |  |  |  |  | 3.7 |  |
Aggregate limited amount for pollution liability under insurance program | 685 |  |  |  |  |  |  | 650 |  |  |  |  |
Amount of insurance claim recognized |  | 42 |  | 50 |  | 547 |  |  |  |  |  |  |
Amount of insurance claim recognized, net of tax |  |  | 6 |  | 7 |  |  |  |  |  |  |  |
Number of actions or claims filed |  |  |  |  |  |  |  |  | 45 |  |  | 45 | 1

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