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DEBT - LONG TERM DEBT REPAYMENTS (Details) $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018 CAD ($)	Mar. 31, 2018 USD ($)	Jan. 31, 2018 CAD ($)
Enbridge Southern Lights L P | 4.014% medium-term note due June 2040
DEBT
Face amount of notes issued			$ 9
Interest rate (as a percent)			4.01%
Spectra Energy Capitals, LLC
DEBT
Gain (loss) on extinguishment of debt	$ 37	$ 29
Spectra Energy Capitals, LLC | 6.75% Senior Unsecured Notes Due 2032
DEBT
Face amount of notes issued		$ 64
Interest rate (as a percent)		6.75%
Repayments of debt		$ 80
Spectra Energy Capitals, LLC | 7.50% Senior Unsecured Notes Due 2038
DEBT
Face amount of notes issued		$ 43
Interest rate (as a percent)		7.50%
Repayments of debt		$ 59
Spectra Energy Capitals, LLC | 5.65% Senior Unsecured Notes Due 2020
DEBT
Face amount of notes issued		$ 163
Interest rate (as a percent)		5.65%
Repayments of debt		$ 172
Spectra Energy Capitals, LLC | 3.30% Senior Unsecured Notes Due 2023
DEBT
Face amount of notes issued		$ 498
Interest rate (as a percent)		3.30%
Repayments of debt		$ 508

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