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ACQUISITIONS AND DISPOSITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - Spectra Energy Capital, LLC $ in Millions | 12 Months Ended
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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

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