ACQUISITIONS AND DISPOSITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - Spectra Energy Capital, LLC $ in Millions	12 Months Ended
Dec. 31, 2017 CAD ($)
Business Acquisition [Line Items]
Revenues	$ 45,669
Earnings attributable to common shareholders	2,902
Merger transaction costs	180
After-tax merger transaction costs	$ 131

Business Combination, Acquisition Related Costs Net of Tax

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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