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COMMITMENTS AND CONTINGENCIES - CONTINGENCIES (Details) CAD in Millions, $ in Millions |  |  | 1 Months Ended | 12 Months Ended | 77 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 09, 2010 USD ($) bbl | Jul. 26, 2010 bbl | Jul. 26, 2010 mi | Jul. 26, 2010 km | Jun. 30, 2015 USD ($) a | May 31, 2015 USD ($) a | Mar. 31, 2013 USD ($) item | Dec. 31, 2016 USD ($) item | Dec. 31, 2016 USD ($) item | Dec. 31, 2016 CAD | Dec. 31, 2016 CAD item | Dec. 31, 2015 CAD | Dec. 31, 2014 item | Apr. 30, 2011 USD ($) | Sep. 09, 2010 CAD
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate limited amount for pollution liability under insurance program |  |  |  |  |  |  |  | $ 900 | $ 900 |  |  |  |  | $ 650 |
Environmental liabilities | CAD |  |  |  |  |  |  |  |  |  |  | CAD 142 | CAD 141 |  |  |
Enbridge Energy Partners, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Economic interest ownership percentage |  |  |  |  |  |  |  | 35.30% | 35.30% |  | 35.30% | 35.70% | 33.70% |  |
Line 6B Crude Oil Release |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost, net of tax | CAD |  |  |  |  |  |  |  |  |  |  | CAD 195 |  |  |  |
Amount of insurance claim recognized, net of tax | CAD |  |  |  |  |  |  |  |  |  | CAD 80 |  |  |  |  |
Line 6B Crude Oil Release | Enbridge Energy Partners, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated volume of oil released (in barrels) | bbl |  | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Area affected by released crude oil |  |  | 38 | 61 |  |  |  |  |  |  |  |  |  |  |
Minimum acres of wetland provided through restoration | a |  |  |  |  |  | 300 |  |  |  |  |  |  |  |  |
Payment for mitigation of impacts on banks, bottomlands and watershed |  |  |  |  |  | $ 5 |  |  |  |  |  |  |  |  |
Estimated cost |  |  |  |  |  |  |  | $ 1,200 | $ 1,200 |  |  |  |  |  |
Amount of insurance claim recognized |  |  |  |  |  |  |  |  | 547 |  |  |  |  |  |
Expected insurance recovery |  |  |  |  |  |  |  | $ 650 | 650 |  |  |  |  |  |
Insurance claim filed amount |  |  |  |  |  |  | $ 145 |  |  |  |  |  |  |  |
Number of insurer disputing claim | item |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |  |
Proceeds from insurance recoveries to date |  |  |  |  |  |  |  | $ 42 | $ 42 |  |  |  |  |  |
Number of actions or claims filed | item |  |  |  |  |  |  |  | 2 | 2 |  | 2 |  |  |  |
Estimated fine or penalty amount |  |  |  |  |  |  |  | $ 69 | $ 69 |  |  |  |  |  |
Civil penalty |  |  |  |  |  |  |  | 61 |  |  |  |  |  |  |
Civil penalties agreed to be paid |  |  |  |  |  |  |  | 61 | 61 |  |  |  |  |  |
Line 6A Crude Oil Release |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost, net of tax | CAD |  |  |  |  |  |  |  |  |  |  |  |  |  |  | CAD 7
Number of actions or claims filed | item |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Line 6A Crude Oil Release | Enbridge Energy Partners, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated volume of oil released (in barrels) | bbl | 9,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated volume of oil removed from the pipeline as part of the repair (in barrels) | bbl | 1,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated cost | $ 53 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated liability | CAD |  |  |  |  |  |  |  |  |  |  | CAD 0 |  |  |  |
Civil penalties agreed to be paid |  |  |  |  |  |  |  | 1 | 1 |  |  |  |  |  |
Separate Agreement Related to Line 6A and 6B Crude Oil Release |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Negotiated amount paid |  |  |  |  | $ 4 |  |  |  |  |  |  |  |  |  |
Amount of restoration land negotiated | a |  |  |  |  | 175 |  |  |  |  |  |  |  |  |  |
Lakehead System Line 6A and 6B Crude Oil Release | Enbridge Energy Partners, L.P. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
CONTINGENCIES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Civil penalties agreed to be paid |  |  |  |  |  |  |  | 62 | 62 |  |  |  |  |  |
Estimated cost of injunctive measures under Consent Decree |  |  |  |  |  |  |  | $ 110 | $ 110 |  |  |  |  |  |

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