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ACQUISITIONS AND DISPOSITIONS - Schedule of Estimated Fair Values Assigned to Net Assets and Final Purchase Price Allocation (Details) $ in Millions | 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 ($) promissoryNote | Jan. 02, 2024 USD ($) | Nov. 01, 2023 CAD ($) | Sep. 27, 2022 CAD ($) | Sep. 27, 2022 USD ($) | Dec. 31, 2024 CAD ($) | Jan. 02, 2024 USD ($) promissoryNote | Dec. 31, 2023 CAD ($) | Mar. 31, 2023 CAD ($) | Dec. 31, 2022 CAD ($) | Sep. 27, 2022 USD ($)
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Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  |  |  | $ 36,600,000,000 |  | $ 31,848,000,000 |  | $ 32,440,000,000 |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill expected tax deductible period (in years) |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |
Public Service Company of North Carolina, Incorporated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets | $ 303,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment | 4,147,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term assets | 189,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities | 277,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 1,529,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities | 653,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities | 365,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | 895,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | 2,710,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price | 2,700,000,000 | $ 2,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expected credit loss | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets | 114,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment of long-term debt | 156,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment of regulatory offset | 0 |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |
Public Service Company of North Carolina, Incorporated | Carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Questar Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  | $ 380,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  | 6,013,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term assets |  |  | 163,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  | 416,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  | 1,343,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  | 919,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities |  |  | 527,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 793,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  | 4,144,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  | 4,100,000,000 | $ 3,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Expected credit loss |  |  | 9,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment of long-term debt |  |  | 301,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment of regulatory offset |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Questar Gas Company | Carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  | $ 202,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
The East Ohio Gas Company |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  | 493,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  | 7,276,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term assets |  |  |  |  | 1,689,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  | 551,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 2,612,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  | 1,001,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred income tax liabilities |  |  |  |  | 1,045,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  | 1,603,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | 5,852,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | 5,800,000,000 | $ 4,300 |  |  |  |  |  |  |  |  |  |  |
Expected credit loss |  |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Overfunded pension plan assets |  |  |  |  | 367,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory assets |  |  |  |  | 1,200,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Fair value adjustment of long-term debt |  |  |  |  | 478,000,000 |  |  |  |  |  |  |  |  |  |  |  |
The East Ohio Gas Company | Carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | $ 379,000,000 |  |  |  |  |  |  |  |  |  |  |  |
RNG Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | $ 31,000,000 |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  | 174,000,000 |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  | 5,000,000 |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | 223,000,000 |  |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | 584,000,000 | $ 439 |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt |  |  |  |  |  |  | 550,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  | 207,000,000 |  |  |  |  |  |  |  |  |  |
Other adjustments |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  | 1,348,000,000 | $ 1,000 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  | $ 925,000,000 |  |  |  |  |  |  |  |  |  |
Amortized on a straight-line basis over an weighted-average useful life (in years) |  |  |  |  |  |  | 9 years | 9 years |  |  |  |  |  |  |  |  |
Goodwill expected tax deductible period (in years) |  |  |  |  |  |  | 15 years | 15 years |  |  |  |  |  |  |  |  |
Number Of Non-Interest Promissory Notes | promissoryNote |  |  |  |  |  |  | 6 |  |  |  |  |  | 6 |  |  |  |
Remaining consideration payable, payment period |  |  |  |  |  |  | 2 years | 2 years |  |  |  |  |  |  |  |  |
Assumed debt |  |  |  |  |  |  | $ 757,000,000 | $ 568 |  |  |  |  |  |  |  |  |
RNG Facilities | Non-Interest Bearing Promissory Notes | Notes Payable, Other Payables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent future payment (up to) |  |  |  |  |  |  | $ 808,000,000 |  |  |  |  |  | $ 606 |  |  |  |
RNG Facilities | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized on a straight-line basis over an expected useful life (in years) |  |  |  |  |  |  | 13 years | 13 years |  |  |  |  |  |  |  |  |
RNG Facilities | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized on a straight-line basis over an expected useful life (in years) |  |  |  |  |  |  | 42 years | 42 years |  |  |  |  |  |  |  |  |
Aitken Creek Gas Storage Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  | $ 105,000,000 |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  | 466,000,000 |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  | 20,000,000 |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | 130,000,000 |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  | 46,000,000 |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  | 397,000,000 |  |  |  |  |  |  |  |
Additional consideration |  |  |  |  |  |  |  |  | 70,000,000 |  |  |  |  |  | $ 70,000,000 |  |
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  | $ 467,000,000 |  |  |  |  |  |  |  |
Tri Global Energy, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
Long-term investments |  |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  |  |  |  |
Long-term assets |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  | 61,000,000 |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  | 105,000,000 |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 392,000,000 |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  | 295,000,000 | $ 215 |  |  |  |  |  |
Additional consideration |  |  |  |  |  |  |  |  |  | 49,000,000 |  |  |  |  |  |  | $ 36
Deferred Consideration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  |  |  |  |  |  | 344,000,000 |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | $ 117,000,000 |  |  |  |  |  |  |
Goodwill expected tax deductible period (in years) |  |  |  |  |  |  |  |  |  | 15 years | 15 years |  |  |  |  |  |
Contingent future payment (up to) |  |  |  |  |  |  |  |  |  | $ 72,000,000 |  |  |  |  |  |  | $ 53

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