v3.26.1
Other comprehensive income (loss) information (Tables)
 3 Months Ended
Mar. 31, 2026
Equity [Abstract]  
Changes in accumulated other comprehensive income (loss)
Changes in accumulated other comprehensive income (loss):

millions of Canadian dollars2026 2025 
Balance at January 1(14)(214)
Postretirement benefits liability adjustment:
Current period change excluding amounts reclassified
       from accumulated other comprehensive income
(28)12 
Amounts reclassified from accumulated other comprehensive income3 5 
Balance at March 31(39)(197)
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 dollars2026 2025 
Amortization of postretirement benefits liability adjustment
       included in net benefit cost (a)
(3)(6)
(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 dollars2026 2025 
Postretirement benefits liability adjustments:
Postretirement benefits liability adjustment (excluding amortization)(9)4 
Amortization of postretirement benefits liability adjustment
       included in net benefit cost
— 1 
Total(9)5