Other comprehensive income (loss) information (Tables)

3 Months Ended

Mar. 31, 2024

Equity [Abstract]

Changes in accumulated other comprehensive income (loss)

Changes in accumulated other comprehensive income (loss):

millions of Canadian dollars	2024	2023
Balance at January 1	(677)	(512)
Postretirement benefits liability adjustment:
Current period change excluding amounts reclassified        from accumulated other comprehensive income	4	21
Amounts reclassified from accumulated other comprehensive income	12	10
Balance at March 31	(661)	(481)

Amounts reclassified out of accumulated other comprehensive income (loss) - before tax income (expense)

Amounts reclassified out of accumulated other comprehensive income (loss) - before-tax income (expense):

	Three Months        to March 31
millions of Canadian dollars	2024	2023
Amortization of postretirement benefits liability adjustment        included in net benefit cost (a)	(17)	(13)
(a) This accumulated other comprehensive income component is included in the computation of net benefit cost (note 4).

Income tax expense (credit) for components of other comprehensive income (loss)

Income tax expense (credit) for components of other comprehensive income (loss):

	Three Months        to March 31
millions of Canadian dollars	2024	2023
Postretirement benefits liability adjustments:
Postretirement benefits liability adjustment (excluding amortization)	1	7
Amortization of postretirement benefits liability adjustment        included in net benefit cost	5	3
Total	6	10