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
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