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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28541-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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