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DEBT - Schedule of Long-term Debt Issuances (Details) | 1 Months Ended |  |  |  |  |
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Apr. 30, 2018 CAD ($) | Mar. 31, 2018 USD ($) | Oct. 31, 2017 CAD ($) | Sep. 30, 2017 CAD ($) | Jul. 31, 2017 USD ($) | Jun. 30, 2017 CAD ($) | May 31, 2017 CAD ($) | Jun. 30, 2018 USD ($) | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Nov. 30, 2017 CAD ($) | Oct. 31, 2017 USD ($)
Enbridge Gas Distribution Inc. | 3.51% medium-term notes due November 2047 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |
Fixed interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.51% |
Spectra Energy Partners, LP | Floating rate notes due June 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  | $ 400,000,000 |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 0.70% |  |  |  |  |  |
Spectra Energy Partners, LP | 3.50% Senior Notes Due 2028 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |
Fixed interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 3.50% |  |
Spectra Energy Partners, LP | 4.15% Senior Notes Due 2048 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  | $ 400,000,000 |  |
Fixed interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 4.15% |  |
Union Gas Limited | 2.88% medium-term notes due November 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |
Fixed interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 2.88% |
Union Gas Limited | 3.59% medium-term notes due November 2047 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  |  | $ 250,000,000 |
Fixed interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 3.59% |
Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  | $ 850,000,000 |  |  |  |  |  |  |  |  |  |
Term of credit facility |  | 60 years |  |  |  |  |  |  |  |  |  |
Callable period |  | 10 years |  |  |  |  |  |  |  |  |  |
Term of fixed rate |  | 10 years |  |  |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  | 6.25% |  |  |  |  |  |  |  |  |  |
Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount | $ 750,000,000 |  |  |  |  |  |  |  |  |  |  |
Term of credit facility | 60 years |  |  |  |  |  |  |  |  |  |  |
Callable period | 10 years |  |  |  |  |  |  |  |  |  |  |
Term of fixed rate | 10 years |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 6.625% |  |  |  |  |  |  |  | 6.625% |  |  |
Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  | $ 600,000,000 |  |  |
Term of credit facility | 60 years |  |  |  |  |  |  |  |  |  |  |
Callable period | 5 years |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) | 6.375% |  |  |  |  |  |  |  | 6.375% |  |  |
Enbridge Inc. | Floating rate notes due May 2019 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  | $ 750,000,000 |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  |  | 0.59% |  |  |  |  |
Enbridge Inc. | 3.19% medium-term notes due December 2022 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  | 3.19% |  |  |  |  |  |
Enbridge Inc. | 3.20% medium-term notes due June 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  | $ 450,000,000 |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  | 3.20% |  |  |  |  |  |
Enbridge Inc. | 4.57% medium-term notes due March 2044 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  | $ 300,000,000 |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  |  | 4.57% |  |  |  |  |  |
Enbridge Inc. | Floating rate notes due June 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  | $ 500,000,000 |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  |  | 0.70% |  |  |  |  |  |
Enbridge Inc. | 2.90% senior notes due July 2022 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  | 2.90% |  |  |  |  |  |  |
Enbridge Inc. | 3.70% senior notes due July 2027 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  | $ 700,000,000 |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  | 3.70% |  |  |  |  |  |  |
Enbridge Inc. | Fixed-to-floating rate subordinated notes due July 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  | $ 1,000,000,000 |  |  |  |  |  |  |
Term of credit facility |  |  |  |  | 60 years |  |  |  |  |  |  |
Callable period |  |  |  |  | 10 years |  |  |  |  |  |  |
Term of fixed rate |  |  |  |  | 10 years |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  | 5.50% |  |  |  |  |  |  |
Enbridge Inc. | Fixed-to-floating rate subordinated notes due September 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  | $ 650,000,000 | $ 1,000,000,000 |  |  |  |  |  |  |  |
Term of credit facility |  |  |  | 60 years |  |  |  |  |  |  |  |
Callable period |  |  |  | 10 years |  |  |  |  |  |  |  |
Term of fixed rate |  |  |  | 10 years |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  | 5.40% |  |  |  |  |  |  |  |
Enbridge Inc. | Floating rate notes due January 2020 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Principal Amount |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000
Basis spread on variable rate (as a percent) |  |  | 0.40% |  |  |  |  |  |  |  |  |
Minimum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due July 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  |  | 10 years |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate (as a percent) |  |  |  |  | 7.50% |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 3.64% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.32% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.59% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed-to-floating rate subordinated notes due July 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 3.42% |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed-to-floating rate subordinated notes due September 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 3.25% |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Minimum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  | 10 years |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Minimum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 10 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Minimum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 5 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Minimum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due September 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  | 10 years |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Maximum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  | 30 years |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Maximum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 30 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Maximum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 10 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Maximum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due July 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  |  | 30 years |  |  |  |  |  |  |
Debt Instrument, Redemption, Period One | Maximum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due September 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  | 30 years |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  | 4.39% |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 5.07% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 3.84% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed-to-floating rate subordinated notes due July 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 4.17% |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed-to-floating rate subordinated notes due September 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 4.00% |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Minimum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  | 30 years |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Minimum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 30 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Minimum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 10 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Minimum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due July 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  |  | 30 years |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Minimum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due September 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  | 30 years |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Maximum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  | 60 years |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Maximum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 60 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Maximum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 25 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Maximum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due July 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  |  | 60 years |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Two | Maximum | Enbridge Inc. | Fixed-to-floating rate subordinated notes due September 2077 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate |  |  |  | 60 years |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Three | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 4.59% |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Three | Minimum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 25 years |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Period Three | Maximum | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Period when the notes carry a variable interest rate | 60 years |  |  |  |  |  |  |  |  |  |  |

X
- Definition Debt Instrument, Callable Period + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Term Of Fixed Interest Rate + References No definition available. + Details
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Namespace Prefix: | enb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Variable Rate Period Subsequent To Fixed Rate Period + References No definition available. + Details
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Namespace Prefix: | enb_
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X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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