CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Statement of Comprehensive Income [Abstract]
Earnings	$ 2,490	$ 1,565
Other comprehensive income/(loss), net of tax
Change in unrealized gain/(loss) on cash flow hedges	(25)	116
Change in unrealized loss on net investment hedges	(34)	(377)
Other comprehensive income/(loss) from equity investees and other investments	12	(1)
Excluded components of fair value hedges	4	4
Reclassification to earnings of loss on cash flow hedges	6	0
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	(7)	(4)
Foreign currency translation adjustments	119	1,658
Other comprehensive income, net of tax	75	1,396
Comprehensive income	2,565	2,961
Comprehensive income attributable to noncontrolling interests	(128)	(88)
Comprehensive income attributable to controlling interests	2,437	2,873
Preference share dividends	(103)	(93)
Comprehensive income attributable to common shareholders	$ 2,334	$ 2,780