CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Earnings	$ 1,104	$ 1,060	$ 1,517	$ 4,913
Other comprehensive income/(loss), net of tax
Change in unrealized gain/(loss) on cash flow hedges	29	(170)	(532)	(597)
Change in unrealized gain/(loss) on net investment hedges	154	(74)	(221)	147
Other comprehensive income/(loss) from equity investees	(14)	2	6	19
Excluded components of fair value hedges	(1)	0	7	0
Reclassification to earnings of loss on cash flow hedges	58	28	138	74
Reclassification to earnings of pension and other postretirement benefits amounts	3	1	10	44
Foreign currency translation adjustments	(1,119)	704	1,817	(1,898)
Other comprehensive income/(loss), net of tax	(890)	491	1,225	(2,211)
Comprehensive income	214	1,551	2,742	2,702
Comprehensive (income)/loss attributable to noncontrolling interests	16	(41)	(79)	23
Comprehensive income attributable to controlling interests	230	1,510	2,663	2,725
Preference share dividends	(94)	(96)	(284)	(287)
Comprehensive income attributable to common shareholders	$ 136	$ 1,414	$ 2,379	$ 2,438