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REGULATORY MATTERS - Liquids Pipelines (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018
Canadian Mainline |
Public Utilities, General Disclosures [Line Items] |
Term of CTS establishing a Canadian Local Toll | 10 years
Southern Lights Pipeline |
Public Utilities, General Disclosures [Line Items] |
Pre-determined after-tax rate of return on equity (ROE) (as a percent) | 10.00%
Debt structure (as a percent) | 70.00%
Equity structure (as a percent) | 30.00%

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- Details
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