CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Earnings	$ 623	$ 1,383	$ 4,490	$ 4,047
Other comprehensive income/(loss), net of tax
Change in unrealized gain on cash flow hedges	238	171	359	817
Change in unrealized gain/(loss) on net investment hedges	(358)	(934)	42	(1,187)
Other comprehensive income/(loss) from equity investees	7	(7)	7	(7)
Excluded components of fair value hedges	2	(33)	11	(38)
Reclassification to earnings of loss on cash flow hedges	39	36	58	145
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	(5)	(2)	(13)	(7)
Reclassification to earnings of loss on equity investees	0	16	0	16
Foreign currency translation adjustments	1,386	4,135	(131)	5,308
Other comprehensive income, net of tax	1,309	3,382	333	5,047
Comprehensive income	1,932	4,765	4,823	9,094
Comprehensive income attributable to noncontrolling interests	(45)	(116)	(143)	(187)
Comprehensive income attributable to controlling interests	1,887	4,649	4,680	8,907
Preference share dividends	(89)	(83)	(260)	(330)
Comprehensive income attributable to common shareholders	$ 1,798	$ 4,566	$ 4,420	$ 8,577