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

3 Months Ended

Mar. 31, 2024

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

Changes in Accumulated Other Comprehensive Income (Loss) by Component

	For the three months ended March 31
(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, January 1, 2024	$	837	$	5	$	(1,463)	$	3	$	(618)
Other comprehensive income before reclassifications	685		—		—		—		685
Amounts reclassified from AOCI	—		1		9		—		10
Net other comprehensive income	685		1		9		—		695
Closing balance, March 31, 2024	$	1,522	$	6	$	(1,454)	$	3	$	77
Opening balance, January 1, 2023	$	1,505	$	—	$	(1,410)	$	(4)	$	91
Other comprehensive (loss) income before reclassifications	(27)		—		—		3		(24)
Amounts reclassified from AOCI	—		1		6		—		7
Net other comprehensive (loss) income	(27)		1		6		3		(17)
Closing balance, March 31, 2023	$	1,478	$	1	$	(1,404)	$	(1)	$	74