INTERIM CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) shares in Millions, $ in Millions	Total	Parent	Share capital	Additional paid-in capital	Accumulated other comprehensive Income (loss)	Retained earnings	Non-controlling interest
Beginning balance (shares) at Dec. 31, 2022	930.5
Beginning balance at Dec. 31, 2022	$ 38,886	$ 38,886	$ 25,516	$ 78	$ 91	$ 13,201	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	800	800				800
Other comprehensive income (loss)	(17)	(17)			(17)
Dividends declared	(177)	(177)				(177)
Effect of stock-based compensation expense	$ 10	10		10
Shares issued under stock option plan (shares)	0.4
Shares issued under stock option plan	$ 18	18	22	(4)
Ending balance (shares) at Mar. 31, 2023	930.9
Ending balance at Mar. 31, 2023	$ 39,520	39,520	25,538	84	74	13,824	0
Beginning balance (shares) at Dec. 31, 2023	932.1
Beginning balance at Dec. 31, 2023	$ 42,411	41,492	25,602	88	(618)	16,420	919
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	774	775				775	(1)
Contribution from non-controlling interest	1						1
Other comprehensive income (loss)	718	695			695		23
Dividends declared	(177)	(177)				(177)
Effect of stock-based compensation expense	$ 13	13		13
Shares issued under stock option plan (shares)	0.5
Shares issued under stock option plan	$ 21	21	27	(6)
Ending balance (shares) at Mar. 31, 2024	932.6
Ending balance at Mar. 31, 2024	$ 43,761	$ 42,819	$ 25,629	$ 95	$ 77	$ 17,018	$ 942