ACQUISITIONS AND DISPOSITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - CAD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Questar Gas Company
Business Acquisition [Line Items]
Operating revenues	$ 11,619	$ 10,788	$ 23,589	$ 23,845
Earnings attributable to common shareholders	1,871	1,828	3,402	3,652
Pro forma interest expense		26		52
Pro forma interest expense, net of tax		19		38
EOG Acquisition
Business Acquisition [Line Items]
Operating revenues	11,340	10,748	22,686	23,244
Earnings attributable to common shareholders	$ 1,842	1,871	$ 3,318	3,641
Pro forma interest expense		33		74
Pro forma interest expense, net of tax		$ 24		$ 57

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (h)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479328/805-10-50-2

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