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SUBSEQUENT EVENTS (Details) $ in Millions, $ in Millions | May 09, 2018 CAD ($) | Apr. 30, 2018 USD ($) | Apr. 12, 2018 CAD ($) | May 09, 2018 USD ($) | Apr. 12, 2018 USD ($) | Dec. 31, 2017
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Spectra Energy Partners, LP |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  |  |  | 75.00%
Subsequent Event | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Face amount of notes issued |  |  | $ 750 |  |  |
Maturity period of debt |  |  | 60 years |  |  |
Callable period |  |  | 10 years |  |  |
Term of fixed interest rate |  |  | 10 years |  |  |
Interest rate (as a percent) |  |  | 6.625% |  | 6.625% |
Subsequent Event | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.375% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Face amount of notes issued |  |  |  |  | $ 600 |
Maturity period of debt |  |  | 60 years |  |  |
Callable period |  |  | 5 years |  |  |
Term of fixed interest rate |  |  | 5 years |  |  |
Interest rate (as a percent) |  |  | 6.375% |  | 6.375% |
Subsequent Event | Minimum | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 10 years |  |  |
Subsequent Event | Minimum | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.375% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 5 years |  |  |
Subsequent Event | Minimum | Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 30 years |  |  |
Subsequent Event | Minimum | Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.375% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 10 years |  |  |
Subsequent Event | Minimum | Debt Instrument, Redemption, Period Three | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.375% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 25 years |  |  |
Subsequent Event | Maximum | Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 30 years |  |  |
Subsequent Event | Maximum | Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.375% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 10 years |  |  |
Subsequent Event | Maximum | Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 60 years |  |  |
Subsequent Event | Maximum | Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.375% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 25 years |  |  |
Subsequent Event | Maximum | Debt Instrument, Redemption, Period Three | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.375% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Variable rate period subsequent to fixed rate period |  |  | 60 years |  |  |
Subsequent Event | Canadian Dollar Offered Rate | Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 4.32% |  |  |
Subsequent Event | Canadian Dollar Offered Rate | Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 5.07% |  |  |
Subsequent Event | London Interbank Offered Rate (LIBOR) | Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 3.59% |  |  |
Subsequent Event | London Interbank Offered Rate (LIBOR) | Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 3.84% |  |  |
Subsequent Event | London Interbank Offered Rate (LIBOR) | Debt Instrument, Redemption, Period Three | Enbridge Inc. | Fixed to Floating Rate Subordinated Notes, 6.625% |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  | 4.59% |  |  |
Subsequent Event | Spectra Energy Partners, LP | Sabal Trail Transmission L L C |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Face amount of notes issued |  | $ 750 |  |  |  |
Ownership interest in VIE (as a percent) |  | 50.00% |  |  |  |
Subsequent Event | Spectra Energy Partners, LP | Sabal Trail Transmission L L C | 4.246% Senior Notes Due In 2028 |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Face amount of notes issued |  | $ 500 |  |  |  |
Interest rate (as a percent) |  | 4.246% |  |  |  |
Subsequent Event | Spectra Energy Partners, LP | Sabal Trail Transmission L L C | 4.682% Senior Notes Due in 2038 |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Face amount of notes issued |  | $ 600 |  |  |  |
Interest rate (as a percent) |  | 4.682% |  |  |  |
Subsequent Event | Spectra Energy Partners, LP | Sabal Trail Transmission L L C | 4.832% Senior Notes Due In 2048 |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Face amount of notes issued |  | $ 400 |  |  |  |
Interest rate (as a percent) |  | 4.832% |  |  |  |
CANADA | Discontinued Operations, Disposed of by Sale | Subsequent Event | Renewable Energy Assets |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 49.00% |  |
UNITED STATES | Discontinued Operations, Disposed of by Sale | Subsequent Event | Renewable Energy Assets |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 49.00% |  |
Hohe See Offshore Wind Project | Discontinued Operations, Disposed of by Sale | Subsequent Event |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Ownership interest in equity investment (as a percent) |  |  |  | 49.00% |  |
The Assets | Subsequent Event |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Noncontrolling interest, ownership percentage by parent |  |  |  | 51.00% |  |
Proceeds from sale of equity method investments | $ 1,750 |  |  |  |  |
Midcoast Operating L.P. | Subsequent Event | Enbridge (U.S.) Inc. |  |  |  |  |  |
SUBSEQUENT EVENTS |  |  |  |  |  |
Disposal group, consideration |  |  |  | $ 1,100 |  |

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