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ACQUISITIONS AND DISPOSITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Questar Gas Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Operating revenues | $ 14,882 | $ 10,040 | $ 38,471 | $ 33,885
Earnings attributable to common shareholders | 1,293 | 501 | 4,695 | 4,153
Pro forma interest expense |  | 18 |  | 70
Pro forma interest expense, net of tax |  | 14 |  | 52
EOG Acquisition |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Operating revenues | 14,882 | 10,131 | 37,568 | 33,375
Earnings attributable to common shareholders | 1,296 | 625 | 4,614 | 4,266
Pro forma interest expense |  | 26 |  | 100
Pro forma interest expense, net of tax |  | 20 |  | 77
PSNC Acquisation |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Operating revenues | 15,010 | 9,949 | 37,921 | 33,038
Earnings attributable to common shareholders | $ 1,276 | 506 | $ 4,655 | 4,173
Pro forma interest expense |  | 12 |  | 48
Pro forma interest expense, net of tax |  | $ 9 |  | $ 37

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