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ACQUISITIONS AND DISPOSITIONS - Schedule of Supplemental Pro Forma Consolidated Financial Information (Details) - CAD ($) $ in Millions | 3 Months Ended | 7 Months Ended | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Public Service Company of North Carolina, Incorporated |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Operating revenues | $ 284 |  | $ 54,116 | $ 44,614
Earnings attributable to common shareholders | $ 50 |  | 5,149 | 5,944
Pro forma interest expense |  |  |  | 48
Pro forma interest expense, net of tax |  |  |  | 37
Questar Gas Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Operating revenues |  | $ 755 | 54,698 | 45,918
Earnings attributable to common shareholders |  | $ 75 | 5,193 | 6,005
Pro forma interest expense |  |  |  | 70
Pro forma interest expense, net of tax |  |  |  | 53
The East Ohio Gas Company |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Operating revenues |  |  | 53,788 | 45,058
Earnings attributable to common shareholders |  |  | $ 5,130 | 5,961
Pro forma interest expense |  |  |  | 100
Pro forma interest expense, net of tax |  |  |  | $ 77

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