DEBT - Schedule of Interest Expense (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
DEBT
Capitalized	$ (348)	$ (391)	$ (321)
Total interest expense	2,703	2,556	1,590
Spectra Energy
DEBT
Amortization of fair value adjustment - Spectra Energy acquisition	(131)	(270)	0
Debentures and term notes
DEBT
Interest expense on debt	3,011	3,011	1,714
Commercial paper and credit facility draws
DEBT
Interest expense on debt	$ 171	$ 206	$ 197

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Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense.

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Amount of interest costs capitalized disclosed as an adjusting item to interest costs incurred.

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Amount of the cost of borrowed funds accounted for as interest expense.

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