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Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly).

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NONCONTROLLING INTERESTS - REDEEMABLE NONCONTROLLING INFORMATION (Details) - CAD ($) shares in Millions, $ in Millions		6 Months Ended
	Jan. 22, 2018	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Noncontrolling interests
Noncontrolling Interest [Line Items]
Spectra Energy Partners, LP restructuring (Note 9)		$ 1,486	$ 0
Additional paid-in capital
Noncontrolling Interest [Line Items]
Dilution gain on Spectra Energy Partners, LP restructuring (Note 10)		1,136	$ 0
Spectra Energy Partners, LP
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent				75.00%
Stock issued during period, shares, conversion of units (in shares)	172.5
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Variable interest ntity, ownership, shares (in shares)	403.0
Ownership interest in VIE (as a percent)	83.00%
Other Restructuring \| Spectra Energy Partners, LP
Noncontrolling Interest [Line Items]
Deferred tax liabilities, net		$ 333
Incentive Distribution Rights \| Spectra Energy Partners, LP
Noncontrolling Interest [Line Items]
Noncontrolling interest, ownership percentage by parent				100.00%