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ACQUISITIONS AND DISPOSITIONS - Narrative (Details) $ in Millions, $ in Millions |  |  |  |  |  |  | 3 Months Ended | 7 Months Ended | 10 Months Ended | 12 Months Ended |  |
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Sep. 30, 2024 CAD ($) | Sep. 30, 2024 USD ($) | May 31, 2024 CAD ($) | May 31, 2024 USD ($) | Mar. 06, 2024 CAD ($) | Mar. 06, 2024 USD ($) | Jan. 02, 2024 CAD ($) facility | Jan. 02, 2024 USD ($) facility | Nov. 01, 2023 CAD ($) | Sep. 27, 2022 CAD ($) | Sep. 27, 2022 USD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($) | Jan. 02, 2024 USD ($) | Sep. 27, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of production facilities acquired | facility |  |  |  |  |  |  | 6 | 6 |  |  |  |  |  |  |  |  |  |
Public Service Company of North Carolina, Incorporated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as percent) | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | $ 2,700 | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ 2,710 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  | $ 50 |  |  | $ 5,149 | $ 5,944 |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  | $ 284 |  |  | 54,116 | 44,614 |  |
Questar Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as percent) |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | $ 4,100 | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | $ 4,144 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  | $ 75 |  | 5,193 | 6,005 |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  | $ 755 |  | 54,698 | 45,918 |  |
The East Ohio Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | $ 5,800 | $ 4,300 |  |  |  |  |  |  |  |  |  |  |  |
Revenues generated by acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,200 |  |  |  |
Earnings generated by acquiree |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 190 |  |  |  |
Cash |  |  |  |  | $ 5,852 |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings attributable to common shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,130 | 5,961 |  |
Operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,788 | $ 45,058 |  |
RNG Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | $ 1,348 | $ 1,000 |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | $ 584 | $ 439 |  |  |  |  |  |  |  |  |  |
Remaining consideration payable, payment period |  |  |  |  |  |  | 2 years | 2 years |  |  |  |  |  |  |  |  |  |
Contingent consideration payable |  |  |  |  |  |  | $ 757 |  |  |  |  |  |  |  |  |  | $ 568 |
Aitken Creek Gas Storage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | $ 400 |  |  |  |  |  |  |  |  |
Tri Global Energy, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | $ 344 |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  | 295 | $ 215 |  |  |  |  |  |  |
Contingent future payment (up to) |  |  |  |  |  |  |  |  |  | $ 72 |  |  |  |  |  |  |  | $ 53
Aitken Creek Gas Storage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as percent) |  |  |  |  |  |  |  |  | 93.80% |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | $ 467 |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | $ 397 |  |  |  |  |  |  |  |  |
Aitken Creek North Gas Storage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest acquired (as percent) |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |

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