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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,905	2,904				2,904	$ 1
Other comprehensive income (loss)	(13)	(25)			(25)		12
Dividends declared	(530)	(530)				(530)
Effect of stock-based compensation expense	24	24		24
Shares issued under stock option plan (shares)			1.2
Shares issued under stock option plan	51	51	$ 63	(12)
Non-controlling interest in connection with business acquisition	932						932
Ending balance (shares) at Sep. 30, 2023			931.7
Ending balance at Sep. 30, 2023	42,255	41,310	$ 25,579	90	66	15,575	945
Beginning balance (shares) at Jun. 30, 2023			931.4
Beginning balance at Jun. 30, 2023	41,004	40,079	$ 25,563	88	(544)	14,972	925
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	780	780				780
Other comprehensive income (loss)	630	610			610		20
Dividends declared	(177)	(177)				(177)
Effect of stock-based compensation expense	5	5		5
Shares issued under stock option plan (shares)			0.3
Shares issued under stock option plan	13	13	$ 16	(3)
Ending balance (shares) at Sep. 30, 2023			931.7
Ending balance at Sep. 30, 2023	42,255	41,310	$ 25,579	90	66	15,575	945
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
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