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 ($) promissoryNote	Dec. 31, 2023 CAD ($)
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