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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income $ 4,720 $ 4,448 $ 5,625
Other comprehensive income (loss)      
Net gain (loss) on foreign currency translation (286) 388 (101)
Net change in pension and other postretirement benefit plans 424 1,025 (334)
Derivative instruments (2) (20) 96
Other comprehensive income (loss) before income taxes 136 1,393 (339)
Income tax recovery (expense) (183) (134) 29
Other comprehensive income (loss) (47) 1,259 (310)
Comprehensive income $ 4,673 $ 5,707 $ 5,315