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Variable Interest Entities - Additional Information (Details) - CAD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Assets	$ 216,973	$ 218,973
Liabilities	$ 148,161	$ 150,080
Westcoast BC Pipeline | Westcoast LP
Variable Interest Entity [Line Items]
Noncontrolling interest (percent)	87.49%
First Nations Partnership | Westcoast LP
Variable Interest Entity [Line Items]
Ownership interest percentage held by noncontrolling owners	12.50%
Westcoast Energy GP Inc.
Variable Interest Entity [Line Items]
Ownership interest percentage held by noncontrolling owners	0.01%
Westcoast LP | Non-Revolving Term Credit Facility
Variable Interest Entity [Line Items]
Credit facility capacity	$ 100

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
-SubTopic 10
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-Section 45
-Paragraph 25
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481231/810-10-45-25

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Section 50
-Paragraph 3
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481203/810-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)(ii)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 1A
-Subparagraph (b)(2)
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-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

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