CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Earnings	$ 1,521	$ 1,777	$ 3,535	$ 413
Other comprehensive income/(loss), net of tax
Change in unrealized gain/(loss) on cash flow hedges	(157)	(48)	213	(561)
Change in unrealized gain/(loss) on net investment hedges	129	340	222	(375)
Other comprehensive income from equity investees	24	30	2	20
Excluded components of fair value hedges	(1)	5	(2)	8
Reclassification to earnings of loss on cash flow hedges	61	48	113	80
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	6	4	11	7
Foreign currency translation adjustments	(835)	(2,701)	(1,631)	2,936
Other comprehensive income/(loss), net of tax	(773)	(2,322)	(1,072)	2,115
Comprehensive income/(loss)	748	(545)	2,463	2,528
Comprehensive (income)/loss attributable to noncontrolling interests	(9)	50	(6)	(95)
Comprehensive income/(loss) attributable to controlling interests	739	(495)	2,457	2,433
Preference share dividends	(90)	(94)	(182)	(190)
Comprehensive income/(loss) attributable to common shareholders	$ 649	$ (589)	$ 2,275	$ 2,243