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REGULATORY MATTERS - Gas Transmission and Midstream (Narrative) (Details) - Deferred income taxes - Gas Transmission and Midstream - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Public Utilities, General Disclosures [Line Items] |  |
Regulatory assets | $ 511 | $ 826
BC FIeld Services |  |
Public Utilities, General Disclosures [Line Items] |  |
Regulatory assets | $ 349 |

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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