CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - CAD ($) $ in Millions	Total	Total shareholders’ equity	Share capital	Additional paid-in capital	Accumulated other comprehensive (loss) income	Retained earnings	Non-controlling interest
Beginning balance at Dec. 31, 2020	$ 7,319	$ 7,319	$ 1,983	$ 55	$ (2,814)	$ 8,095	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,852	2,852				2,852
Other Comprehensive Income (Loss), Net of Tax	711	711			711
Dividends declared ($0.76 per share)	(556)	(556)				(556)
Effect of stock-based compensation expense	23	23		23
Shares issued for Kansas City Southern acquisition (Note 21)	23,456	23,456	23,461	(5)
Shares issued under stock option plan (Note 21)	24	24	31	(7)
Ending balance at Dec. 31, 2021	$ 33,829	33,829	25,475	66	(2,103)	10,391	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared (CAD per share)	$ 0.76
Net income (loss)	$ 3,517	3,517				3,517
Other Comprehensive Income (Loss), Net of Tax	2,194	2,194			2,194
Dividends declared ($0.76 per share)	(707)	(707)				(707)
Effect of stock-based compensation expense	23	23		23
Shares issued for Kansas City Southern acquisition (Note 21)	(2)	(2)		(2)
Shares issued under stock option plan (Note 21)	32	32	41	(9)
Ending balance at Dec. 31, 2022	$ 38,886	38,886	25,516	78	91	13,201	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared (CAD per share)	$ 0.76
Net income (loss)	$ 3,923	3,927				3,927	(4)
Other Comprehensive Income (Loss), Net of Tax	(718)	(709)			(709)		(9)
Dividends declared ($0.76 per share)	(708)	(708)				(708)
Effect of stock-based compensation expense	27	27		27
Shares issued under stock option plan (Note 21)	69	69	86	(17)
Non-controlling interest in connection with business acquisition (Note 11)	932						932
Ending balance at Dec. 31, 2023	$ 42,411	$ 41,492	$ 25,602	$ 88	$ (618)	$ 16,420	$ 919
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends declared (CAD per share)	$ 0.76