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Changes in Accumulated other comprehensive income ("AOCI") by component (Tables)

9 Months Ended

Sep. 30, 2025

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Changes in Accumulated Other Comprehensive Income by Component

Changes in AOCI and Accumulated other comprehensive loss ("AOCL") attributable to controlling shareholders, net of tax, by component are as follows:

			For the three months ended September 30
(in millions of Canadian dollars)			Foreign currency net of hedging activities			Derivatives			Pension and post- retirement defined benefit plans			Equity accounted investments			Total
Opening balance, July 1, 2025			$	1,678		$	11		$	(736)		$	(2)		$	951
Other comprehensive income before reclassifications			646			—			—			3			649
Amounts reclassified from AOCI			—			(1)			3			—			2
Net other comprehensive income (loss)			646			(1)			3			3			651
Balance as at September 30, 2025			$	2,324		$	10		$	(733)		$	1		$	1,602
Opening balance, July 1, 2024			$	1,816		$	8		$	(1,446)		$	1		$	379
Other comprehensive loss before reclassifications			(412)			—			—			(5)			(417)
Amounts reclassified from AOCL			—			1			9			—			10
Net other comprehensive (loss) income			(412)			1			9			(5)			(407)
Balance as at September 30, 2024			$	1,404		$	9		$	(1,437)		$	(4)		$	(28)

			For the nine months ended September 30
			Foreign currency net of hedging activities			Derivatives			Pension and post- retirement defined benefit plans			Equity accounted investments			Total
Opening balance, January 1, 2025			$	3,413		$	10		$	(738)		$	(5)		$	2,680
Other comprehensive loss before reclassifications			(1,089)			—			—			6			(1,083)
Amounts reclassified from AOCI			—			—			5			—			5
Net other comprehensive (loss) income			(1,089)			—			5			6			(1,078)
Balance as at September 30, 2025			$	2,324		$	10		$	(733)		$	1		$	1,602
Opening balance, January 1, 2024			$	837		$	5		$	(1,463)		$	3		$	(618)
Other comprehensive income (loss) before reclassifications			567			—			—			(7)			560
Amounts reclassified from AOCL			—			4			26			—			30
Net other comprehensive income (loss)			567			4			26			(7)			590
Balance as at September 30, 2024			$	1,404		$	9		$	(1,437)		$	(4)		$	(28)

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- References

No definition available.

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- Definition

Tabular disclosure of the components of accumulated other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481674/830-30-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481694/830-30-45-20

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