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ACQUISITIONS AND DISPOSITIONS - Summary of Estimated Fair Values Assigned to Net Assets (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 ($) promissoryNote | Jan. 02, 2024 USD ($) | Jan. 02, 2024 USD ($) promissoryNote | Dec. 31, 2023 CAD ($)
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Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |
Goodwill | $ 34,858,000,000 |  |  |  |  |  |  |  |  | $ 31,848,000,000
PSNC Acquisation |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |
Current assets | 351,000,000 |  |  |  |  |  |  |  |  |
Property, plant and equipment | 4,113,000,000 |  |  |  |  |  |  |  |  |
Long-term assets | 203,000,000 |  |  |  |  |  |  |  |  |
Current liabilities | 292,000,000 |  |  |  |  |  |  |  |  |
Long-term debt | 1,529,000,000 |  |  |  |  |  |  |  |  |
Other long-term liabilities | 667,000,000 |  |  |  |  |  |  |  |  |
Deferred income tax liabilities | 365,000,000 |  |  |  |  |  |  |  |  |
Goodwill | 868,000,000 |  |  |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |
Cash | 2,682,000,000 |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |  |
Purchase price | 2,700,000,000 | $ 2,000 |  |  |  |  |  |  |  |
Expected credit loss | 2,000,000 |  |  |  |  |  |  |  |  |
Regulatory assets | 128,000,000 |  |  |  |  |  |  |  |  |
Fair value adjustment of long-term debt | 156,000,000 |  |  |  |  |  |  |  |  |
Fair value adjustment of regulatory offset | 0 |  |  |  |  |  |  |  |  |
PSNC Acquisation | Carrying value |  |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |  |
Trade receivables | $ 50,000,000 |  |  |  |  |  |  |  |  |
Questar Gas Company |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |
Current assets |  |  | $ 464,000,000 |  |  |  |  |  |  |
Property, plant and equipment |  |  | 5,921,000,000 |  |  |  |  |  |  |
Long-term assets |  |  | 191,000,000 |  |  |  |  |  |  |
Current liabilities |  |  | 407,000,000 |  |  |  |  |  |  |
Long-term debt |  |  | 1,343,000,000 |  |  |  |  |  |  |
Other long-term liabilities |  |  | 948,000,000 |  |  |  |  |  |  |
Deferred income tax liabilities |  |  | 522,000,000 |  |  |  |  |  |  |
Goodwill |  |  | 751,000,000 |  |  |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |
Cash |  |  | 4,107,000,000 |  |  |  |  |  |  |
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 |  |  | $ 201,000,000 |  |  |  |  |  |  |
EOG Acquisition |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  | $ 641,000,000 |  |  |  |  |
Property, plant and equipment |  |  |  |  | 7,253,000,000 |  |  |  |  |
Long-term assets |  |  |  |  | 1,647,000,000 |  |  |  |  |
Current liabilities |  |  |  |  | 670,000,000 |  |  |  |  |
Long-term debt |  |  |  |  | 2,612,000,000 |  |  |  |  |
Other long-term liabilities |  |  |  |  | 993,000,000 |  |  |  |  |
Deferred income tax liabilities |  |  |  |  | 1,036,000,000 |  |  |  |  |
Goodwill |  |  |  |  | 1,608,000,000 |  |  |  |  |
Purchase price: |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | 5,838,000,000 |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |  |
Purchase price |  |  |  |  | 5,800,000,000 | $ 4,300 |  |  |  |
Expected credit loss |  |  |  |  | 3,000,000 |  |  |  |  |
Overfunded pension plan assets |  |  |  |  | 395,000,000 |  |  |  |  |
Regulatory assets |  |  |  |  | 1,200,000,000 |  |  |  |  |
Fair value adjustment of long-term debt |  |  |  |  | 478,000,000 |  |  |  |  |
EOG Acquisition | Carrying value |  |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |  |
Trade receivables |  |  |  |  | $ 376,000,000 |  |  |  |  |
RNG Facilities |  |  |  |  |  |  |  |  |  |
Fair value of net assets acquired: |  |  |  |  |  |  |  |  |  |
Current assets |  |  |  |  |  |  | $ 31,000,000 |  |  |
Intangible assets |  |  |  |  |  |  | 925,000,000 |  |  |
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 |  |
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 (in years) |  |  |  |  |  |  | 2 years | 2 years |  |
Consideration transferred, liabilities incurred |  |  |  |  |  |  | $ 757,000,000 | $ 568 |  |
RNG Facilities | Non-Interest Bearing Promissory Notes | Notes Payable, Other Payables |  |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |  |
Deferred payments |  |  |  |  |  |  | $ 808,000,000 |  | $ 606 |
RNG Facilities | Minimum |  |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |  |
Amortized on a straight-line basis over term (in years) |  |  |  |  |  |  | 13 years | 13 years |  |
RNG Facilities | Maximum |  |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |  |
Amortized on a straight-line basis over term (in years) |  |  |  |  |  |  | 42 years | 42 years |  |

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