v3.25.4

Income taxes - Expected Income Tax Expense at Canadian Statutory Rates Reconciled to Income Tax Expense (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Amount
Canadian federal statutory income tax rate(2)	$ 822	$ 1,246	$ (797)
Provincial tax effects(3)		(17)	(14)
Statutory rate difference		(41)	(62)
Other		(24)	26
Inflation		(33)	(31)
Nontaxable or nondeductible items	11
Changes in unrecognized tax benefits	(1)	3	(10)
Reversal of outside basis deferred income tax (Note 11)		0	(7,832)
Remeasurement loss of Kansas City Southern		0	1,873
(Gains) losses not subject to tax		(10)	10
Effect of tax rate decrease		(70)	(72)
Deduction for dividends taxed on outside basis		0	(68)
Valuation allowance		5	1
Income tax expense (recovery) (Note 7)	$ 1,345	$ 1,059	$ (6,976)
Percent
Canadian federal statutory income tax rate(2)	15.00%	26.11%	26.11%
Nontaxable or nondeductible items	0.20%
Changes in unrecognized tax benefits	(0.02%)
Effective tax rate	24.54%
U.S.
Amount
Provincial tax effects(3)	$ 43
Statutory rate difference	65
Tax credits	(51)
Other	$ 10
Percent
Provincial tax effects(3)	0.78%
Statutory rate difference	1.19%
Tax credits	(0.93%)
Other	0.18%
Mexico
Amount
Statutory rate difference	$ 158
Other	33
Inflation	$ (48)
Percent
Statutory rate difference	2.88%
Inflation	(0.88%)
Other	0.60%
Switzerland
Amount
Provincial tax effects(3)	$ 27
Statutory rate difference	(52)
Other	$ 34
Percent
Provincial tax effects(3)	0.49%
Statutory rate difference	(0.95%)
Other	0.62%
Other jurisdictions
Amount
Statutory rate difference	$ 25
Percent
Statutory rate difference	0.46%
Canada
Amount
Provincial tax effects(3)	$ 276
Tax credits	(2)
Other	$ (5)
Percent
Provincial tax effects(3)	5.03%
Tax credits	(0.04%)
Other	(0.09%)

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