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REGULATORY MATTERS - Schedule of Regulatory Assets and Liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Liquids Pipelines | Tolling deferrals |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | $ (25) | $ (28)
Liquids Pipelines | Pipeline future abandonment costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (293) | (201)
Liquids Pipelines | Deferred income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 1,767 | 1,673
Liquids Pipelines | Recoverable income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 24 | 27
Liquids Pipelines | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 32 | 0
Gas Transmission and Midstream | Pipeline future abandonment costs |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (159) | (111)
Gas Transmission and Midstream | Regulatory liability related to income taxes3 |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (866) | (912)
Gas Transmission and Midstream | Deferred income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 511 | 826
Gas Transmission and Midstream | Long-term debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 108 | 124
Gas Transmission and Midstream | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 215 | 205
Gas Distribution and Storage |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 145 | 0
Gas Distribution and Storage | Purchased gas variance |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (19) |
Gas Distribution and Storage | Future removal and site restoration reserves5 |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) | (1,424) | (1,107)
Gas Distribution and Storage | Other |  |
Regulatory Liabilities [Line Items] |  |
Regulatory (liabilities) |  | (4)
Gas Distribution and Storage | Deferred income taxes |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 1,273 | 1,132
Gas Distribution and Storage | Long-term debt |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 362 | 387
Gas Distribution and Storage | Purchased gas variance |  |
Regulatory Assets [Line Items] |  |
Regulatory assets |  | 197
Gas Distribution and Storage | Pension plans and OPEB |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 275 | 118
Gas Distribution and Storage | Constant dollar net salvage adjustment |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | 0 | $ 6
Gas Distribution and Storage | Other |  |
Regulatory Assets [Line Items] |  |
Regulatory assets | $ 88 |

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