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REVENUES - Additional Information - Narrative (Details) $ in Billions	12 Months Ended
	Dec. 31, 2019 CAD ($)
Long-term pipeline capacity arrangements and transportation contracts
Disaggregation of Revenue [Line Items]
Future revenues, remaining performance obligation	$ 26.6
Rate-regulated firm capacity contracts
Disaggregation of Revenue [Line Items]
Future revenues, expected timing of satisfaction, explanation	one to three years
Natural gas storage and other
Disaggregation of Revenue [Line Items]
Future revenues, remaining performance obligation	$ 0.8

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- Definition

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+ References

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045

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- Definition

Description of when remaining performance obligation is expected to be recognized as revenue.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130556-203045

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