INTERIM CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - CAD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 590	$ 602
Net (loss) gain in foreign currency translation adjustments, net of hedging activities	(336)	10
Change in derivatives designated as cash flow hedges	1	25
Change in pension and post-retirement defined benefit plans	39	53
Equity Accounted Investments	62	0
Other comprehensive (loss) income before income taxes	(234)	88
Income tax expense on above items	(36)	(30)
Other comprehensive (loss) income	(270)	58
Comprehensive income	$ 320	$ 660