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NONCONTROLLING INTERESTS - NONCONTROLLING INFORMATION (Details) CAD / shares in Units, $ / shares in Units, CAD in Millions, $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 13, 2015 USD ($) | Mar. 13, 2015 CAD | Jan. 02, 2015 USD ($) $ / shares | Jan. 02, 2015 CAD | Jan. 01, 2015 | Jul. 01, 2014 USD ($) $ / shares shares | Jul. 01, 2014 CAD shares | Dec. 31, 2016 CAD CAD / shares shares | Dec. 31, 2015 CAD | Dec. 31, 2014 CAD
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | CAD 577 | CAD 1,300 |
Enbridge Energy Partners, L.P. | Alberta Clipper Pipeline |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Investment ownership percentage transferred |  |  | 66.70% | 66.70% |  |  |  |  |  |
Consideration received |  |  | $ 1,000 | CAD 1,100 |  |  |  |  |  |
Consideration received as debt repayment |  |  | 306 | 359 |  |  |  |  |  |
Enbridge Energy Partners, L.P. | Alberta Clipper Pipeline | Preference Shares, Series E |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Equity received as consideration |  |  | $ 694 | 814 |  |  |  |  |  |
Enbridge Energy Partners, L.P. |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | (99) | 412 |
Distributions to unitholders |  |  |  |  |  |  |  | CAD 670 | CAD 630 | CAD 504
Ownership interest percentage held by noncontrolling owners |  |  |  |  |  |  |  | 80.20% | 80.00% |
Reduction in income (loss) attributable to noncontrolling interests and redeemable noncontrolling interests due to reallocation |  |  |  |  |  |  |  | CAD 816 | CAD (13) |
Increase (decrease) in noncontrolling interest |  |  |  | (304) |  |  | CAD (2,363) |  |  |
Increase to additional paid in capital |  |  |  | 218 |  |  | 1,601 |  |  |
Increase to deferred income taxes |  |  |  | CAD 86 |  |  | CAD 762 |  |  |
GP interest percent in EEP | 2.00% | 2.00% |  |  |  |  |  |  |  |
Contributions from unitholders | $ 289 | CAD 366 |  |  |  |  |  |  |  |
Enbridge Energy Partners, L.P. | Preference Shares, Series E |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Conversion rate for Class A units |  |  | 100.00% | 100.00% |  |  |  |  |  |
Period for redemption at the issuers option |  |  | 30 years | 30 years |  |  |  |  |  |
Liquidation price (in dollars per share) | $ / shares |  |  | $ 38.31 |  |  |  |  |  |  |
Trailing period for determination of liquidation price |  |  | 5 days | 5 days |  |  |  |  |  |
Enbridge Energy Partners, L.P. | Alberta Clipper Pipeline |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Ownership percentage before transfer |  |  |  |  | 33.30% |  |  |  |  |
Enbridge Energy Partners, L.P. | Natural gas and NGL midstream business |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Ownership percentage transfer within segments |  |  |  |  |  | 12.60% | 12.60% |  |  |
Consideration cash portion |  |  |  |  |  | $ 350 | CAD 376 |  |  |
Limited partner interest and all incentive distribution rights of (IDR) percent in MEP |  |  |  |  |  | 52.00% | 52.00% |  |  |
Previous ownership percentage in natural gas and midstream business |  |  |  |  |  | 61.00% | 61.00% |  |  |
Current ownership percentage in natural gas and midstream business |  |  |  |  |  | 48.00% | 48.00% |  |  |
Enbridge Energy Partners, L.P. | Enbridge Inc. |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Percent of distributions and allocations above which the Company has waived rights to receive |  |  |  |  |  | 2.00% | 2.00% |  |  |
Units issued (in shares) | shares |  |  |  |  |  | 66,100,000 | 66,100,000 |  |  |
IDU issued | shares |  |  |  |  |  | 1,000 | 1,000 |  |  |
Previous percentage of distributions |  |  |  |  |  | 48.00% | 48.00% |  |  |
Previous distribution threshold | $ / shares |  |  |  |  |  | $ 0.495 |  |  |  |
Current percentage of distributions |  |  |  |  |  | 23.00% | 23.00% |  |  |
Current distribution threshold | $ / shares |  |  |  |  |  | $ 0.5435 |  |  |  |
Enbridge Energy Management, L.L.C. (EEM) |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | CAD 36 | CAD 203 |
Ownership interest percentage held by noncontrolling owners |  |  |  |  |  |  |  | 88.30% | 88.30% |
Enbridge Gas Distribution Inc. |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Number of cumulative redeemable preferred shares held by third parties | shares |  |  |  |  |  |  |  | 4,000,000 |  |
Floating adjustable cumulative cash dividends as a percentage of prime rate |  |  |  |  |  |  |  | 80.00% |  |
Floating adjustable cumulative cash dividend variable rate |  |  |  |  |  |  |  | Prime |  |
Redemption price per share (in dollars per shares) | CAD / shares |  |  |  |  |  |  |  | CAD 25 |  |
Preferred shares redeemed (in shares) | shares |  |  |  |  |  |  |  | 0 |  |
Enbridge Gas Distribution Inc. | Preference shares |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | CAD 100 | CAD 100 |
Enbridge Gas Distribution Inc. | Common shares |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Ownership percentage in subsidiary |  |  |  |  |  |  |  | 100.00% |  |
Renewable energy assets |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | CAD 516 | 561 |
Other noncontrolling interest |  |  |  |  |  |  |  |  |  |
NONCONTROLLING INTERESTS |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | CAD 24 | CAD 24 |

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