CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Earnings	$ 6,314	$ 3,416	$ 5,827
Other comprehensive income/(loss), net of tax
Change in unrealized gain/(loss) on cash flow hedges	162	(457)	(437)
Change in unrealized gain on net investment hedges	49	102	281
Other comprehensive income/(loss) from equity investees	(12)	(1)	40
Excluded components of fair value hedges	(5)	5	0
Reclassification to earnings of loss on cash flow hedges	235	198	127
Reclassification to earnings of pension and other postretirement benefits (OPEB) amounts	21	13	13
Reclassification to earnings of gain on equity investees	(62)	0	0
Actuarial gain/(loss) on pension and OPEB	394	(167)	(96)
Foreign currency translation adjustments	(507)	(853)	(3,035)
Other comprehensive income/(loss), net of tax	275	(1,160)	(3,107)
Comprehensive income	6,589	2,256	2,720
Comprehensive income attributable to noncontrolling interests	(95)	(22)	(7)
Comprehensive income attributable to controlling interests	6,494	2,234	2,713
Preference share dividends	(373)	(380)	(383)
Comprehensive income attributable to common shareholders	$ 6,121	$ 1,854	$ 2,330