CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Statement of Comprehensive Income [Abstract]
Earnings	$ 1,830	$ 1,327	$ 3,853	$ 1,837
Other comprehensive income/(loss), net of tax
Change in unrealized gain/(loss) on cash flow hedges	(235)
Change in unrealized gain/(loss) on cash flow hedges		27	(427)	93
Change in unrealized gain/(loss) on net investment hedges	127	(99)	221	(283)
Other comprehensive income from equity investees	5	5	17	19
Reclassification to earnings of loss on cash flow hedges	35		46
Reclassification to earnings of loss on cash flow hedges		36		73
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	5	62	43	23
Foreign currency translation adjustments	(1,311)	1,047	(2,602)	2,626
Other comprehensive income/(loss), net of tax	(1,374)	1,078	(2,702)	2,551
Comprehensive income	456	2,405	1,151	4,388
Comprehensive (income)/loss attributable to noncontrolling interests and redeemable noncontrolling interests	51	(297)	64	(444)
Comprehensive income attributable to controlling interests	507	2,108	1,215	3,944
Preference share dividends	(96)	(89)	(191)	(178)
Comprehensive income attributable to common shareholders	$ 411	$ 2,019	$ 1,024	$ 3,766