CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - CAD ($) $ in Millions	Total	Share capital	Additional paid-in capital	Accumulated other comprehensive loss	Retained earnings	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjustment Retained earnings	Cumulative Effect, Period of Adoption, Adjusted Balance	Cumulative Effect, Period of Adoption, Adjusted Balance Retained earnings
Beginning balance at Dec. 31, 2019	$ 7,069	$ 1,993	$ 48	$ (2,522)	$ 7,550			$ 7,068	$ 7,549
Beginning balance (Accounting Standards Update 2016-13) at Dec. 31, 2019						$ (1)	$ (1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,444				2,444
Other comprehensive (loss) income	(292)			(292)
Dividends declared	(479)				(479)
Effect of stock-based compensation expense	17		17
CP Common Shares repurchased	(1,477)	(58)			(1,419)
Shares issued under stock option plan	38	48	(10)
Ending balance at Dec. 31, 2020	7,319	1,983	55	(2,814)	8,095
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	2,852				2,852
Other comprehensive (loss) income	711			711
Dividends declared	(556)				(556)
Effect of stock-based compensation expense	23		23
Shares issued for Kansas City Southern acquisition	23,456	23,461	(5)
Shares issued under stock option plan	24	31	(7)
Ending balance at Dec. 31, 2021	33,829	25,475	66	(2,103)	10,391
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	3,517				3,517
Other comprehensive (loss) income	2,194			2,194
Dividends declared	(707)				(707)
Effect of stock-based compensation expense	23		23
Shares issued for Kansas City Southern acquisition	(2)		(2)
Shares issued under stock option plan	32	41	(9)
Ending balance at Dec. 31, 2022	$ 38,886	$ 25,516	$ 78	$ 91	$ 13,201