INTERIM CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) shares in Millions, $ in Millions	Total	Total shareholders’ equity	Share capital	Additional paid-in capital	Accumulated other comprehensive income	Retained earnings	Non-controlling interest
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 (loss)	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
Beginning balance (shares) at Dec. 31, 2024			933.5
Beginning balance at Dec. 31, 2024	48,890	47,892	$ 25,689	94	2,680	19,429	998
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	909	910				910	(1)
Contribution from non-controlling interest	1						1
Other comprehensive income (loss)	(28)	(27)			(27)		(1)
Dividends declared	(177)	(177)				(177)
Effect of stock-based compensation expense	$ 16	16		16
Common Shares repurchased (in shares)	(3.3)
Common Shares repurchased	$ (375)	(375)	$ (96)			(279)
Shares issued under stock option plan (shares)			0.2
Shares issued under stock option plan	7	7	$ 10	(3)
Ending balance (shares) at Mar. 31, 2025			930.4
Ending balance at Mar. 31, 2025	$ 49,243	$ 48,246	$ 25,603	$ 107	$ 2,653	$ 19,883	$ 997