CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Earnings	$ 1,777	$ 1,830	$ 413	$ 3,853
Other comprehensive income/(loss), net of tax
Change in unrealized loss on cash flow hedges	(48)	(235)	(561)	(427)
Change in unrealized gain/(loss) on net investment hedges	340	127	(375)	221
Other comprehensive income from equity investees	30	5	20	17
Excluded components of fair value hedges	5	0	8	0
Reclassification to earnings of loss on cash flow hedges	48	35	80	46
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	4	5	7	43
Foreign currency translation adjustments	(2,701)	(1,311)	2,936	(2,602)
Other comprehensive income/(loss), net of tax	(2,322)	(1,374)	2,115	(2,702)
Comprehensive income/(loss)	(545)	456	2,528	1,151
Comprehensive (income)/loss attributable to noncontrolling interests	50	51	(95)	64
Comprehensive income/(loss) attributable to controlling interests	(495)	507	2,433	1,215
Preference share dividends	(94)	(96)	(190)	(191)
Comprehensive income/(loss) attributable to common shareholders	$ (589)	$ 411	$ 2,243	$ 1,024