DEBT - LONG TERM DEBT ISSUANCE (Details)	1 Months Ended
	Apr. 30, 2018 CAD ($)	Mar. 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)
3.50% Senior Notes Due 2028 | Spectra Energy Partners, LP
DEBT
Face amount of notes issued				$ 400,000,000
Interest rate (as a percent)				3.50%
4.15% Senior Notes Due 2048 | Spectra Energy Partners, LP
DEBT
Face amount of notes issued				$ 400,000,000
Interest rate (as a percent)				4.15%
Enbridge Inc. | Fixed to Floating Rate Notes Due 2078
DEBT
Face amount of notes issued		$ 850,000,000
Interest rate (as a percent)		6.25%
Maturity period of debt		60 years
Callable period		10 years
Term of fixed interest rate		10 years
Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018
DEBT
Face amount of notes issued	$ 750,000,000
Interest rate (as a percent)	6.625%		6.625%
Maturity period of debt	60 years
Callable period	10 years
Term of fixed interest rate	10 years
Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018
DEBT
Face amount of notes issued			$ 600,000,000
Interest rate (as a percent)	6.375%		6.375%
Maturity period of debt	60 years
Callable period	5 years
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078
DEBT
Basis spread on variable rate (as a percent)		3.64%
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 | Minimum
DEBT
Variable rate period subsequent to fixed rate period		10 years
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 | Maximum
DEBT
Variable rate period subsequent to fixed rate period		30 years
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018
DEBT
Basis spread on variable rate (as a percent)	4.32%
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 | Minimum
DEBT
Variable rate period subsequent to fixed rate period	10 years
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 | Maximum
DEBT
Variable rate period subsequent to fixed rate period	30 years
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018
DEBT
Basis spread on variable rate (as a percent)	3.59%
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 | Minimum
DEBT
Variable rate period subsequent to fixed rate period	5 years
Debt Instrument, Redemption, Period One | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 | Maximum
DEBT
Variable rate period subsequent to fixed rate period	10 years
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078
DEBT
Basis spread on variable rate (as a percent)		4.39%
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 | Minimum
DEBT
Variable rate period subsequent to fixed rate period		30 years
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078 | Maximum
DEBT
Variable rate period subsequent to fixed rate period		60 years
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018
DEBT
Basis spread on variable rate (as a percent)	5.07%
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 | Minimum
DEBT
Variable rate period subsequent to fixed rate period	30 years
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, Issued April 2018 | Maximum
DEBT
Variable rate period subsequent to fixed rate period	60 years
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018
DEBT
Basis spread on variable rate (as a percent)	3.84%
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 | Minimum
DEBT
Variable rate period subsequent to fixed rate period	10 years
Debt Instrument, Redemption, Period Two | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 | Maximum
DEBT
Variable rate period subsequent to fixed rate period	25 years
Debt Instrument, Redemption, Period Three | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018
DEBT
Basis spread on variable rate (as a percent)	4.59%
Debt Instrument, Redemption, Period Three | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 | Minimum
DEBT
Variable rate period subsequent to fixed rate period	25 years
Debt Instrument, Redemption, Period Three | Enbridge Inc. | Fixed to Floating Rate Notes Due 2078, US Based Issued April 2018 | Maximum
DEBT
Variable rate period subsequent to fixed rate period	60 years