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LONG-TERM INVESTMENTS - ADDITIONAL DISCLOSURES (Details) € in Millions, £ in Millions, shares in Millions, CAD in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 29, 2016 shares | Nov. 30, 2015 item | Dec. 31, 2016 GBP (£) | Dec. 31, 2016 GBP (£) mi | Dec. 31, 2016 GBP (£) km | Dec. 31, 2016 GBP (£) MW | Dec. 31, 2016 CAD | Dec. 31, 2015 CAD | Dec. 31, 2014 CAD shares | Dec. 31, 2016 EUR (€) | Dec. 31, 2016 CAD | May 19, 2016 item | Nov. 04, 2015 | Jul. 01, 2014
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | CAD 1,620 | CAD 536 | CAD 18 |  |  |  |  |
Preference shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent) |  |  | 4.38% | 4.38% | 4.38% | 4.38% |  |  |  | 4.38% | 4.38% |  |  |
Eddystone Rail Company, LLC | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment impairment |  |  |  |  |  |  | 184 |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 75.00% | 75.00% | 75.00% | 75.00% |  |  |  | 75.00% | 75.00% |  |  |
Aux Sable |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset impairment charges |  |  |  |  |  |  | 37 |  |  |  |  |  |  |
Eolien Maritime France SAS |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |
Number of licenses for large-scale wind farms | item |  |  |  |  |  |  |  |  |  |  |  | 3 |  |
Enbridge's portion of development costs incurred to date |  |  |  |  |  |  |  |  |  | € 136 | CAD 194 |  |  |
Eolien Maritime France SAS | Long Term Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge's portion of development costs incurred to date |  |  |  |  |  |  |  |  |  |  | 58 |  |  |
Eolien Maritime France SAS | Deferred Amounts And Other Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Enbridge's portion of development costs incurred to date |  |  |  |  |  |  |  |  |  |  | 136 |  |  |
Rampion Offshore Wind Project |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  | 24.90% |  |  |  |  |  |  |  |  |  |  | 24.90% |
Wind project capacity | MW |  |  |  |  |  | 400 |  |  |  |  |  |  |  |
Distance off the shore from the UK Sussex coast |  |  |  | 8 | 13 |  |  |  |  |  |  |  |  |
Estimated total amount of investment |  |  | £ 370.0 | £ 370.0 | £ 370.0 | £ 370.0 |  |  |  |  | 750 |  |  |
Power purchase agreement period |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Total number of investors | item |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Amount of investment to date |  |  | £ 195.0 | £ 195.0 | £ 195.0 | £ 195.0 |  |  |  |  | CAD 345 |  |  |
Rampion Offshore Wind Project | UK Green Investment Bank plc |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest of other investor (as a percent) |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |
Rampion Offshore Wind Project | E.ON Climate And Renewables UK Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest of other investor (as a percent) |  | 50.10% |  |  |  |  |  |  |  |  |  |  |  |
Southern Access Extension Project | Liquids Pipelines |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage sold |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.00%
Ownership interest (as a percent) |  |  | 65.00% | 65.00% | 65.00% | 65.00% |  |  |  | 65.00% | 65.00% |  |  | 65.00%
Noverco | Common shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest (as a percent) |  |  | 38.90% | 38.90% | 38.90% | 38.90% |  | 38.90% |  | 38.90% | 38.90% |  |  |
Reciprocal ownership interest held by investee (as a percent) |  |  | 3.40% | 3.40% | 3.40% | 3.40% |  | 3.60% | 3.60% | 3.40% | 3.40% |  |  |
Number of reciprocal shares purchased through secondary offering | shares | 1.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reciprocal shares sold through secondary offering | shares |  |  |  |  |  |  |  |  | 1.3 |  |  |  |  |
Indirect pro-rata interest of the entity in the shares of the entity (as a percent) |  |  | 1.30% | 1.30% | 1.30% | 1.30% |  | 1.40% | 1.40% | 1.30% | 1.30% |  |  |
Amount reduced from equity investment and shareholder's equity by the reciprocal shareholding |  |  |  |  |  |  | CAD 102 | CAD 83 | CAD 83 |  |  |  |  |
Noverco | Preference shares |  |  |  |  |  |  |  |  |  |  |  |  |  |
LONG-TERM INVESTMENTS |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative dividends per share calculation, maturity period of Government of Canada bond |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Cumulative dividends based on average yield of Government of Canada bonds, spread over reference rate (as a percent) |  |  | 4.38% | 4.38% | 4.38% | 4.38% |  |  |  | 4.38% | 4.38% |  |  |

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