v3.25.4
Other comprehensive income (loss) information (Tables)
 12 Months Ended
Dec. 31, 2025
Equity [Abstract]  
Changes in Accumulated Other Comprehensive Income (Loss)
Changes in accumulated other comprehensive income (loss):

millions of Canadian dollars2025 2024 2023 
Balance at January 1(214)(677)(512)
Postretirement benefits liability adjustment:   
Current period change excluding amounts reclassified
       from accumulated other comprehensive income		181 412 (206)
Amounts reclassified from accumulated other comprehensive income19 51 41 
Balance at December 31(14)(214)(677)
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):

millions of Canadian dollars2025 2024 2023 
Amortization of postretirement benefits liability adjustment
       included in net benefit cost (a)
(25)(67)(54)
(a)  This accumulated other comprehensive income component is included in the computation of net periodic 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):
millions of Canadian dollars2025 2024 2023 
Postretirement benefits liability adjustments:  
Postretirement benefits liability adjustment (excluding amortization)59 134 (66)
Amortization of postretirement benefits liability adjustment
       included in net benefit cost
6 16 13 
Total65 150 (53)