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]
Earnings	$ 2,321	$ 2,001	$ 4,811	$ 3,566
Other comprehensive income/(loss), net of tax
Change in unrealized gain/(loss) on cash flow hedges	11	12	(14)	128
Gain/(loss) on net investment hedges (Note 10)	447	(161)	413	(538)
Other comprehensive income from equity investees and other investments	9	2	21	1
Excluded components of fair value hedges	10	0	14	4
Reclassification to earnings of loss on cash flow hedges	8	9	14	9
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	(6)	(5)	(13)	(9)
Reclassification of actuarial gain on pension and OPEB from regulatory asset	49	0	49	0
Foreign currency translation adjustments	(3,534)	727	(3,415)	2,385
Other comprehensive income/(loss), net of tax	(3,006)	584	(2,931)	1,980
Comprehensive income/(loss)	(685)	2,585	1,880	5,546
Comprehensive (income)/loss attributable to noncontrolling interests	20	(72)	(108)	(160)
Comprehensive income/(loss) attributable to controlling interests	(665)	2,513	1,772	5,386
Preference share dividends	(102)	(95)	(205)	(188)
Comprehensive income/(loss) attributable to common shareholders	$ (767)	$ 2,418	$ 1,567	$ 5,198