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ACQUISITIONS AND DISPOSITIONS - Schedule of Estimated Preliminary Fair Values Assigned to Net Assets (Details) $ in Millions | May 31, 2024 CAD ($) | May 31, 2024 USD ($) | Mar. 06, 2024 CAD ($) | Mar. 06, 2024 USD ($) | Jan. 02, 2024 CAD ($) Promissorynote | Jan. 02, 2024 USD ($) | Jun. 30, 2025 CAD ($) | Dec. 31, 2024 CAD ($) | Jan. 02, 2024 USD ($) Promissorynote
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Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 35,162,000,000 | $ 36,600,000,000 |
Questar Gas Company |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
EOG Acquisition |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |
Fair value adjustment of regulatory offset |  |  | 0 |  |  |  |  |  |
EOG Acquisition | Carrying Value |  |  |  |  |  |  |  |  |
Deferred consideration |  |  |  |  |  |  |  |  |
Trade receivables |  |  | $ 379,000,000 |  |  |  |  |  |
RNG Facilities |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |  |  |  |  |  |  |
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 |  |  |
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 (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 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 |  |  |

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