v3.25.2
Other comprehensive income (loss) information (Tables)
 6 Months Ended
Jun. 30, 2025
Equity [Abstract]  
Changes in accumulated other comprehensive income (loss)
Changes in accumulated other comprehensive income (loss):

millions of Canadian dollars2025 2024 
Balance at January 1(214)(677)
Postretirement benefits liability adjustment:
Current period change excluding amounts reclassified
       from accumulated other comprehensive income
12 4 
Amounts reclassified from accumulated other comprehensive income10 25 
Balance at June 30(192)(648)
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):
 
      Second Quarter
       Six Months
       to June 30
millions of Canadian dollars2025 2024 2025 2024 
Amortization of postretirement benefits liability adjustment
       included in net benefit cost (a)
(7)(17)(13)(34)
(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):
      Second Quarter
       Six Months
       to June 30
millions of Canadian dollars2025 2024 2025 2024 
Postretirement benefits liability adjustments:
Postretirement benefits liability adjustment (excluding amortization)— (1)4 — 
Amortization of postretirement benefits liability adjustment
       included in net benefit cost
2 4 3 9 
Total2 3 7 9