INTERIM CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 1,234	$ 903	$ 2,143	$ 1,677
Net (loss) gain in foreign currency translation adjustments, net of hedging activities	(1,729)	301	(1,758)	1,000
Change in derivatives designated as cash flow hedges	0	3	1	4
Change in pension and post-retirement defined benefit plans	2	11	5	23
Other comprehensive income (loss) from equity investees	3	(2)	3	(2)
Other comprehensive (loss) income before income taxes	(1,724)	313	(1,749)	1,025
Income tax (expense) recovery	(32)	0	(35)	6
Net other comprehensive (loss) income	(1,756)	313	(1,784)	1,031
Comprehensive (loss) income	(522)	1,216	359	2,708
Comprehensive (loss) income attributable to non-controlling interest	(54)	9	(56)	31
Comprehensive (loss) income attributable to controlling shareholders	$ (468)	$ 1,207	$ 415	$ 2,677