CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Earnings	$ 6,058	$ 2,938	$ 6,314
Other comprehensive income/(loss), net of tax
Change in unrealized gain on cash flow hedges	220	847	162
Change in unrealized gain/(loss) on net investment hedges	409	(971)	49
Other comprehensive income/(loss) from equity investees	6	(6)	(12)
Excluded components of fair value hedges	12	(35)	(5)
Reclassification to earnings of loss on cash flow hedges	14	143	235
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	(18)	(10)	21
Reclassification to earnings of (gain)/loss on equity investees	0	16	(62)
Actuarial gain/(loss) on pension and OPEB	(130)	312	394
Foreign currency translation adjustments	(1,728)	4,406	(507)
Other comprehensive income/(loss), net of tax	(1,215)	4,702	275
Comprehensive income	4,843	7,640	6,589
Comprehensive (income)/loss attributable to noncontrolling interests	131	(21)	(95)
Comprehensive income attributable to controlling interests	4,974	7,619	6,494
Preference share dividends	(352)	(414)	(373)
Comprehensive income attributable to common shareholders	$ 4,622	$ 7,205	$ 6,121