CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,713	$ 3,923	$ 3,517
Net gain (loss) in foreign currency translation adjustments, net of hedging activities	2,622	(655)	1,628
Change in derivatives designated as cash flow hedges	6	7	6
Change in pension and post-retirement defined benefit plans	979	(73)	680
Other comprehensive (loss) income from equity investees	(8)	7	(5)
Other comprehensive income (loss) before income taxes	3,599	(714)	2,309
Income tax expense on above items	(219)	(4)	(115)
Net other comprehensive income (loss)	3,380	(718)	2,194
Comprehensive income	7,093	3,205	5,711
Comprehensive income (loss) attributable to non-controlling interest	77	(13)	0
Comprehensive income attributable to controlling shareholders	$ 7,016	$ 3,218	$ 5,711