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 (loss)	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	2,514	2,517				2,517	(3)
Contribution from non-controlling interest	2						2
Other comprehensive income (loss)	609	590			590		19
Dividends declared	(532)	(532)				(532)
Effect of stock-based compensation expense	20	20		20
Shares issued under stock option plan (shares)			1.2
Shares issued under stock option plan	56	56	$ 70	(14)
Ending balance (shares) at Sep. 30, 2024			933.3
Ending balance at Sep. 30, 2024	45,080	44,143	$ 25,672	94	(28)	18,405	937
Beginning balance (shares) at Jun. 30, 2024			933.1
Beginning balance at Jun. 30, 2024	44,823	43,872	$ 25,655	93	379	17,745	951
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	837	837				837	0
Contribution from non-controlling interest	1						1
Other comprehensive income (loss)	(422)	(407)			(407)		(15)
Dividends declared	(177)	(177)				(177)
Effect of stock-based compensation expense	4	4		4
Shares issued under stock option plan (shares)			0.2
Shares issued under stock option plan	14	14	$ 17	(3)
Ending balance (shares) at Sep. 30, 2024			933.3
Ending balance at Sep. 30, 2024	45,080	44,143	$ 25,672	94	(28)	18,405	937
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	3,060	3,064				3,064	(4)
Contribution from non-controlling interest	1						1
Other comprehensive income (loss)	(1,112)	(1,078)			(1,078)		(34)
Dividends declared	(592)	(592)				(592)
Effect of stock-based compensation expense	25	25		25
Common Shares repurchased (in shares)			(33.4)
Common Shares repurchased	(3,665)	(3,665)	$ (939)			(2,726)
Shares issued under stock option plan (shares)			1.0
Shares issued under stock option plan	52	52	$ 65	(13)
Ending balance (shares) at Sep. 30, 2025			901.1
Ending balance at Sep. 30, 2025	46,659	45,698	$ 24,815	106	1,602	19,175	961
Beginning balance (shares) at Jun. 30, 2025			917.9
Beginning balance at Jun. 30, 2025	47,147	46,204	$ 25,285	105	951	19,863	943
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	917	920				920	(3)
Other comprehensive income (loss)	672	651			651		21
Dividends declared	(205)	(205)				(205)
Effect of stock-based compensation expense	5	5		5
Common Shares repurchased (in shares)			(17.0)
Common Shares repurchased	(1,892)	(1,892)	$ (489)			(1,403)
Shares issued under stock option plan (shares)			0.2
Shares issued under stock option plan	15	15	$ 19	(4)
Ending balance (shares) at Sep. 30, 2025			901.1
Ending balance at Sep. 30, 2025	$ 46,659	$ 45,698	$ 24,815	$ 106	$ 1,602	$ 19,175	$ 961