DEBT - Schedule of Interest Expense (Details) - CAD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
DEBT
Capitalized interest	$ (192)	$ (326)	$ (348)
Total interest expense	2,790	2,663	2,703
Spectra Energy Capital, LLC
DEBT
Amortization of fair value adjustment	(54)	(67)	(131)
Debentures and term notes
DEBT
Interest expense on debt	2,913	2,783	3,011
Commercial paper and credit facility draws
DEBT
Interest expense on debt	$ 123	$ 273	$ 171

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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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Total interest costs incurred during the period and either capitalized or charged against earnings.

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

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