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REGULATORY MATTERS - Schedule of Regulatory Assets and Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Liquids Pipelines | Tolling deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | $ (28) | $ (34)
Liquids Pipelines | Pipeline future abandonment costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (201) | (141)
Liquids Pipelines | Deferred income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 1,673 | 1,492
Liquids Pipelines | Recoverable income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 27 | 46
Gas Transmission and Midstream | Regulatory liability related to income taxes2 |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (912) | (1,078)
Gas Transmission and Midstream | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) |  | (16)
Gas Transmission and Midstream | Deferred income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 826 | 717
Gas Transmission and Midstream | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 94 |
Gas Distribution | Future removal and site restoration reserves5 |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (1,107) | (1,066)
Gas Distribution | Site restoration clearance adjustment |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | 0 | (31)
Gas Distribution | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (4) |
Gas Distribution | Deferred income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 1,132 | 1,000
Gas Distribution | Purchased gas variance |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 197 | 51
Gas Distribution | Pension plans and OPEB |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 118 | 102
Gas Distribution | Constant dollar net salvage adjustment |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 6 | 38
Gas Distribution | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets |  | $ 31

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