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Employee retirement benefits (Tables)

9 Months Ended

Sep. 30, 2025

Retirement Benefits [Abstract]

Schedule of net benefit costs

The components of net benefit cost were as follows:

			Third Quarter						Nine Months        to September 30
millions of Canadian dollars			2025			2024			2025			2024
Pension benefits:
Service cost			46			47			139			139
Interest cost			93			91			277			274
Expected return on plan assets			(99)			(113)			(296)			(340)
Amortization of prior service cost			7			7			21			21
Amortization of actuarial loss (gain)			2			11			8			35
Net pension enhancement			19			—			19			—
Net benefit cost			68			43			168			129
Other postretirement benefits:
Service cost			2			3			4			10
Interest cost			4			7			15			19
Amortization of prior service cost (credit)			(1)			—			(3)			—
Amortization of actuarial loss (gain)			(1)			(2)			(6)			(6)
Net other postretirement benefits enhancement			1			—			1			—
Net benefit cost			5			8			11			23

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- References

No definition available.

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- Definition

Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 715
-SubTopic 20
-Subparagraph (h)
-Name Accounting Standards Codification
-Paragraph 1
-Section 50
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

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