CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Earnings	$ 3,416	$ 5,827	$ 3,333
Other comprehensive income/(loss), net of tax
Change in unrealized loss on cash flow hedges	(457)	(437)
Change in unrealized loss on cash flow hedges			(153)
Change in unrealized gain/(loss) on net investment hedges	102	281	(458)
Other comprehensive income/(loss) from equity investees	(1)	40	38
Excluded components of fair value hedges	5	0	0
Reclassification to earnings of loss on cash flow hedges	198	127
Reclassification to earnings of loss on cash flow hedges			152
Reclassification to earnings of pension and other postretirement benefits amounts	13	13	12
Actuarial loss on pension plans and other postretirement benefits	(167)	(96)	(52)
Foreign currency translation adjustments	(853)	(3,035)	4,599
Other comprehensive income/(loss), net of tax	(1,160)	(3,107)	4,138
Comprehensive income	2,256	2,720	7,471
Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interests	(22)	(7)	(801)
Comprehensive income attributable to controlling interests	2,234	2,713	6,670
Preference share dividends	(380)	(383)	(367)
Comprehensive income attributable to common shareholders	$ 1,854	$ 2,330	$ 6,303